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  <p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;letter-spacing:-.1pt;">UNITED STATES</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;letter-spacing:-.1pt;">SECURITIES AND EXCHANGE COMMISSION</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">Washington, D.C. 20549</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;letter-spacing:-.1pt;">FORM&nbsp;8-K</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;letter-spacing:-.1pt;">CURRENT REPORT</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;letter-spacing:-.1pt;">PURSUANT TO SECTION&nbsp;13 OR 15(d)&nbsp;OF</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;letter-spacing:-.1pt;">THE SECURITIES EXCHANGE ACT OF 1934</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">Date of Report (Date of earliest event reported) April&nbsp;28,
  2008</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;letter-spacing:-.1pt;">MARKWEST ENERGY PARTNERS, L.P.</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">(Exact name of registrant as specified in its charter)</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">&nbsp;</font></p>
  
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    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">Delaware</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">001-31239</font></b> </p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">27-0005456</font></b></p>
    </td>
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    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;letter-spacing:-.1pt;">(State or other jurisdiction of</font> </font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">(Commission File Number)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;letter-spacing:-.1pt;">(I.R.S. Employer</font> </font></p>
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    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">incorporation or organization)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;letter-spacing:-.1pt;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">Identification Number)</font></p>
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  <p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">1515 Arapahoe
  Street, Tower 2, Suite&nbsp;700, Denver, CO 80202</font></b>  </p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">(Address of principal executive
  offices)</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">Registrant&#146;s telephone number,
  including area code: <b>303-925-9200</b></font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;letter-spacing:-.1pt;">Not Applicable.</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">(Former name or former address,
  if changed since last report.)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">Check the appropriate box below
  if the Form&nbsp;8-K filing is intended to simultaneously satisfy the filing
  obligation of the registrant under any of the following provisions (see General
  Instruction A.2. below):</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;letter-spacing:-.1pt;">o</font><font style="letter-spacing:-.1pt;">&nbsp;&nbsp;&nbsp;&nbsp;Written Communications
  pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;letter-spacing:-.1pt;">o</font><font style="letter-spacing:-.1pt;">&nbsp;&nbsp;&nbsp;&nbsp;Soliciting material
  pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;letter-spacing:-.1pt;">o</font><font style="letter-spacing:-.1pt;">&nbsp;&nbsp;&nbsp;&nbsp;Pre-Commencement
  communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17
  CFR 240.14d-2(b))</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-align:left;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;letter-spacing:-.1pt;">o</font><font style="letter-spacing:-.1pt;">&nbsp;&nbsp;&nbsp;&nbsp;Pre-Commencement
  communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17
  CFR 240.13e-4(c))</font></p>
  
  <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">
  
  <p style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div align="left" style="margin:0in 0in .0001pt;text-align:left;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\105541\08-13194-1\task2909671\13194-1-ba.htm',USER='105541',CD='May  1 21:43 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 1.01.&#160;
  Entry into a Material Agreement.</font></b></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On
  April&nbsp;28, 2008, MarkWest Energy Partners L.P. (the &#147;Partnership&#148;) entered
  into a Purchase Agreement, dated April&nbsp;28, 2008 (the &#147;Purchase Agreement&#148;),
  among the Partnership, its wholly-owned subsidiary, MarkWest Energy Finance
  Corporation (&#147;Finance Corp&#148; and together with the Partnership, the &#147;Issuers&#148;),
  certain subsidiary guarantors named therein (the &#147;Guarantors&#148;) and J.P. Morgan
  Securities Inc., RBC Capital Markets Corporation and Wachovia Capital Markets,
  LLC, as representatives of the several initial purchasers, relating to the sale
  and issuance of $100,000,000 in aggregate principal amount of the Issuers&#146; 8&#190;%
  senior unsecured notes due 2018 (the &#147;Senior Notes&#148;).&#160; The Senior Notes are being offered as
  additional debt securities under an indenture (the &#147;Indenture&#148;)&#160; pursuant to which the Issuers issued
  $400,000,000 in aggregate principal amount of our 8&#190;% Senior Notes due 2018 on April&nbsp;15,
  2008 (the &#147;Existing Senior Notes&#148;).</font></p>
  
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font face="Times New Roman">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On May&nbsp;1, 2008, the Issuers entered
  into a Registration Rights Agreement, dated May&nbsp;1, 2008 (the &#147;Registration
  Rights Agreement&#148;), among the Issuers, the Guarantors and J.P. Morgan
  Securities Inc., RBC Capital Markets Corporation and Wachovia Securities LLC,
  as representatives of the several initial purchasers, each relating to the
  Senior Notes.&#160; Pursuant to the
  Registration Rights Agreement, the Issuers and the Guarantors will use their
  reasonable best efforts to file a registration statement with the SEC with
  respect to an offer to exchange the Existing Senior Notes and the Senior Notes for
  substantially identical notes that are registered under the Securities Act. &#160;The Issuers and Guarantors have agreed that
  the exchange offer will be completed within six months of April&nbsp;15, 2008, the
  closing date of the Existing Senior Notes private placement.&#160; Under some circumstances, in lieu of a
  registered exchange offer, the Issuers and the Guarantors have agreed to file&nbsp;a
  shelf registration statement with respect to the Existing Senior Notes and
  Senior Notes and to use their reasonable best efforts to keep the shelf
  registration statement effective until the earlier of the period specified in Rule&nbsp;144&nbsp;for
  the Existing Senior Notes and Senior Notes to become unrestricted securities or
  the sale pursuant to the shelf registration statement of all of the Existing Senior
  Notes and Senior notes registered thereunder. The Issuers and the Guarantors
  are required to pay additional interest if they fail to comply with their
  obligations to register the Existing Senior Notes and Senior Notes within the
  specified time periods.</font></p>
  
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:.5in;"><font face="Times New Roman">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The description set forth above is
  qualified in its entirety by the Indenture, which was included as an exhibit to
  our Current Report on Form&nbsp;8-K filed on April&nbsp;15, 2008, and the
  Registration Rights Agreement, which is filed herewith as Exhibit&nbsp;4.1.</font></p>
  
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:.5in;"><font face="Times New Roman">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 2.03.
  Creation of a Direct Financial Obligation or an Obligation under an Off-Balance
  Sheet Arrangement of a Registrant.</font></b></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;The information included in Item 1.01
  of this Current Report on Form&nbsp;8-K is incorporated by reference into this
  Item 2.03 of this Current Report on Form&nbsp;8-K.</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 8.01.&#160;
  Other Events.</font></b></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On April&nbsp;28, 2008, the Partnership
  issued a press release announcing the offering and the pricing of the Senior Notes.&#160; A copy of the Partnership&#146;s press release is
  filed as Exhibit&nbsp;99.1 to this Current Report on Form&nbsp;8-K and is
  incorporated herein by reference.</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The press release shall not constitute an
  offer to sell or the solicitation of an offer to buy, nor shall there be any
  sale of these securities in any state in which the offer, solicitation or sale
  would be unlawful prior to the registration or qualification under the
  securities laws of any such state.</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  
  <div align="left" style="margin:0in 0in .0001pt;text-align:left;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\105541\08-13194-1\task2909671\13194-1-ba.htm',USER='105541',CD='May  1 21:43 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 9.01.&#160;
  Financial Statements and Exhibits.</font></b></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.45in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Exhibits.</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt .5in;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="15%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:15.66%;">
    <p style="margin:0in 0in .0001pt;text-align:justify;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit&nbsp;No.</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="81%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:81.66%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description of Exhibit</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="15%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:15.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="81%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:81.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registration Rights Agreement dated as of May&nbsp;1, 2008 among
    MarkWest Energy Partner, L.P., MarkWest Energy Finance Corporation, and the
    several guarantors named therein, and J.P. Morgan Securities Inc., RBC
    Capital Markets Corporation and Wachovia Securities LLC, as representatives
    of the several underwriters named therein.</font></p>
    </td>
   </tr>
   <tr>
    <td width="15%" valign="top" style="padding:0in 0in 0in 0in;width:15.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="81%" valign="top" style="padding:0in 0in 0in 0in;width:81.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="15%" valign="top" style="padding:0in 0in 0in 0in;width:15.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="81%" valign="top" style="padding:0in 0in 0in 0in;width:81.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press release dated April&nbsp;28, 2008,
    announcing offering and pricing of private placement of senior notes.</font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>
  
  <div align="left" style="margin:0in 0in .0001pt;text-align:left;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
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  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <h1 style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:auto;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURE</font></b></h1>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the
  Securities and Exchange Act of 1934, the Registrant has duly caused this report
  to be signed on its behalf by the undersigned, thereunto duly authorized.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:49.84%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">MARKWEST ENERGY PARTNERS, L.P.</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Registrant)</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
    </td>
    <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">MarkWest Energy GP, L.L.C.,</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Its General Partner</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:&nbsp;&nbsp;&nbsp;May&nbsp;1, 2008</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
    </td>
    <td width="46%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;/s/ NANCY K. BUESE</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="46%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Nancy K. Buese</font></p>
    </td>
   </tr>
   <tr>
    <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.16%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.5%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Senior Vice President&nbsp;&amp; Chief Financial Officer</font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>
  
  <div align="left" style="margin:0in 0in .0001pt;text-align:left;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
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  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><u><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT INDEX</font></u></b></p>
  
  <p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="15%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:15.66%;">
    <p style="margin:0in 0in .0001pt;text-align:justify;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit&nbsp;No.</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="81%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:81.66%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description of Exhibit</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="15%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:15.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="81%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:81.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registration
    Rights Agreement dated as of May&nbsp;1, 2008 among MarkWest Energy Partner,
    L.P., MarkWest Energy Finance Corporation, and the several guarantors named
    therein, and J.P. Morgan Securities Inc., RBC Capital Markets Corporation and
    Wachovia Securities LLC, as representatives of the several underwriters named
    therein.</font></p>
    </td>
   </tr>
   <tr>
    <td width="15%" valign="top" style="padding:0in 0in 0in 0in;width:15.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="81%" valign="top" style="padding:0in 0in 0in 0in;width:81.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="15%" valign="top" style="padding:0in 0in 0in 0in;width:15.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="81%" valign="top" style="padding:0in 0in 0in 0in;width:81.66%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press release dated April&nbsp;28, 2008, announcing offering and
    pricing of private placement of senior notes.</font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>
  
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  </div>
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metadata_documents: [{"type": "8-K", "sequence": "1", "filename": "a08-13194_18k.htm", "description": "8-K", "secsgml_size_bytes": 38074}]
metadata_filer: {"company-data": {"conformed-name": "MARKWEST ENERGY PARTNERS L P", "cik": "0001166036", "assigned-sic": "1311", "irs-number": "270005456", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-31239", "film-number": "08795357"}, "business-address": {"street1": "1515 ARAPAHOE STREET", "street2": "TOWER 2, SUITE 700", "city": "DENVER", "state": "CO", "zip": "80202-2126", "phone": "303-925-9200"}, "mail-address": {"street1": "1515 ARAPAHOE STREET", "street2": "TOWER 2, SUITE 700", "city": "DENVER", "state": "CO", "zip": "80202-2126"}}
text: UNITED STATES
  SECURITIES AND EXCHANGE COMMISSION
  Washington, D.C. 20549
  FORM 8-K
  CURRENT REPORT
  PURSUANT TO SECTION 13 OR 15(d) OF
  THE SECURITIES EXCHANGE ACT OF 1934
  Date of Report (Date of earliest event reported) April 28,
  2008
  MARKWEST ENERGY PARTNERS, L.P.
  (Exact name of registrant as specified in its charter)
  Delaware
  001-31239
  27-0005456
  (State or other jurisdiction of
  (Commission File Number)
  (I.R.S. Employer
  incorporation or organization)
  Identification Number)
  1515 Arapahoe
  Street, Tower 2, Suite 700, Denver, CO 80202
  (Address of principal executive
  offices)
  Registrant's telephone number,
  including area code:
  303-925-9200
  Not Applicable.
  (Former name or former address,
  if changed since last report.)
  Check the appropriate box below
  if the Form 8-K filing is intended to simultaneously satisfy the filing
  obligation of the registrant under any of the following provisions (see General
  Instruction A.2. below):
  o
  Written Communications
  pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
  o
  Soliciting material
  pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
  o
  Pre-Commencement
  communications pursuant to Rule 14d-2(b) under the Exchange Act (17
  CFR 240.14d-2(b))
  o
  Pre-Commencement
  communications pursuant to Rule 13e-4(c) under the Exchange Act (17
  CFR 240.13e-4(c))
  ITEM 1.01. 
  Entry into a Material Agreement.
  On
  April 28, 2008, MarkWest Energy Partners L.P. (the "Partnership") entered
  into a Purchase Agreement, dated April 28, 2008 (the "Purchase Agreement"),
  among the Partnership, its wholly-owned subsidiary, MarkWest Energy Finance
  Corporation ("Finance Corp" and together with the Partnership, the "Issuers"),
  certain subsidiary guarantors named therein (the "Guarantors") and J.P. Morgan
  Securities Inc., RBC Capital Markets Corporation and Wachovia Capital Markets,
  LLC, as representatives of the several initial purchasers, relating to the sale
  and issuance of $100,000,000 in aggregate principal amount of the Issuers' 8¾%
  senior unsecured notes due 2018 (the "Senior Notes").  The Senior Notes are being offered as
  additional debt securities under an indenture (the "Indenture")  pursuant to which the Issuers issued
  $400,000,000 in aggregate principal amount of our 8¾% Senior Notes due 2018 on April 15,
  2008 (the "Existing Senior Notes").
  On May 1, 2008, the Issuers entered
  into a Registration Rights Agreement, dated May 1, 2008 (the "Registration
  Rights Agreement"), among the Issuers, the Guarantors and J.P. Morgan
  Securities Inc., RBC Capital Markets Corporation and Wachovia Securities LLC,
  as representatives of the several initial purchasers, each relating to the
  Senior Notes.  Pursuant to the
  Registration Rights Agreement, the Issuers and the Guarantors will use their
  reasonable best efforts to file a registration statement with the SEC with
  respect to an offer to exchange the Existing Senior Notes and the Senior Notes for
  substantially identical notes that are registered under the Securities Act.  The Issuers and Guarantors have agreed that
  the exchange offer will be completed within six months of April 15, 2008, the
  closing date of the Existing Senior Notes private placement.  Under some circumstances, in lieu of a
  registered exchange offer, the Issuers and the Guarantors have agreed to file a
  shelf registration statement with respect to the Existing Senior Notes and
  Senior Notes and to use their reasonable best efforts to keep the shelf
  registration statement effective until the earlier of the period specified in Rule 144 for
  the Existing Senior Notes and Senior Notes to become unrestricted securities or
  the sale pursuant to the shelf registration statement of all of the Existing Senior
  Notes and Senior notes registered thereunder. The Issuers and the Guarantors
  are required to pay additional interest if they fail to comply with their
  obligations to register the Existing Senior Notes and Senior Notes within the
  specified time periods.
  The description set forth above is
  qualified in its entirety by the Indenture, which was included as an exhibit to
  our Current Report on Form 8-K filed on April 15, 2008, and the
  Registration Rights Agreement, which is filed herewith as Exhibit 4.1.
  ITEM 2.03.
  Creation of a Direct Financial Obligation or an Obligation under an Off-Balance
  Sheet Arrangement of a Registrant.
  The information included in Item 1.01
  of this Current Report on Form 8-K is incorporated by reference into this
  Item 2.03 of this Current Report on Form 8-K.
  ITEM 8.01. 
  Other Events.
  On April 28, 2008, the Partnership
  issued a press release announcing the offering and the pricing of the Senior Notes.  A copy of the Partnership's press release is
  filed as Exhibit 99.1 to this Current Report on Form 8-K and is
  incorporated herein by reference.
  The press release shall not constitute an
  offer to sell or the solicitation of an offer to buy, nor shall there be any
  sale of these securities in any state in which the offer, solicitation or sale
  would be unlawful prior to the registration or qualification under the
  securities laws of any such state.
  2
  ITEM 9.01. 
  Financial Statements and Exhibits.
  (d)       Exhibits.
  Exhibit No.
  Description of Exhibit
  4.1
  Registration Rights Agreement dated as of May 1, 2008 among
    MarkWest Energy Partner, L.P., MarkWest Energy Finance Corporation, and the
    several guarantors named therein, and J.P. Morgan Securities Inc., RBC
    Capital Markets Corporation and Wachovia Securities LLC, as representatives
    of the several underwriters named therein.
  99.1
  Press release dated April 28, 2008,
    announcing offering and pricing of private placement of senior notes.
  3
  SIGNATURE
  Pursuant to the requirements of the
  Securities and Exchange Act of 1934, the Registrant has duly caused this report
  to be signed on its behalf by the undersigned, thereunto duly authorized.
  MARKWEST ENERGY PARTNERS, L.P.
  (Registrant)
  By:
  MarkWest Energy GP, L.L.C.,
  Its General Partner
  Date:   May 1, 2008
  By:
  /s/ NANCY K. BUESE
  Nancy K. Buese
  Senior Vice President & Chief Financial Officer
  4
  EXHIBIT INDEX
  Exhibit No.
  Description of Exhibit
  4.1
  Registration
    Rights Agreement dated as of May 1, 2008 among MarkWest Energy Partner,
    L.P., MarkWest Energy Finance Corporation, and the several guarantors named
    therein, and J.P. Morgan Securities Inc., RBC Capital Markets Corporation and
    Wachovia Securities LLC, as representatives of the several underwriters named
    therein.
  99.1
  Press release dated April 28, 2008, announcing offering and
    pricing of private placement of senior notes.
  5