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STATES</font></div>
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AND EXCHANGE COMMISSION</font></div>
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D.C.&#160;&#160;20549</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">FORM
8-K</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">______________________________</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CURRENT
REPORT</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date of
Report (Date of earliest event reported): October 1, 2008 (September 29,
2008)</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman">EAGLE
ROCK ENERGY PARTNERS, L.P.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
Name of Registrant as Specified in Its Charter)</font></div>
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              </td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">68-0629883</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(State
      or other jurisdiction of</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">incorporation
      or organization)</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Commission</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">File
      Number)</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(I.R.S.
      Employer</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Identification
      Number)</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">16701
Greenspoint Park Drive, Suite&#160;200</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Houston,
Texas 77060</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Address
of principal executive offices, including zip code)</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(281)&#160;408-1200</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant&#8217;s
telephone number, including area code)</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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:</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#9633;&#160;&#160;&#160;Written
communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#9633;&#160;&#160;&#160;Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#9633;&#160;&#160;&#160;Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
240.14d-2(b))</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#9633;&#160;&#160;&#160;Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
240.13e-4(c))</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
1.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Entry
into a Material Definitive Agreement.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>As previously disclosed, on September
11, 2008, Eagle Rock Energy Partners, L.P., a Delaware limited partnership
(&#8220;Eagle Rock&#8221;), entered into a Partnership Interests Purchase Agreement (the
&#8220;Purchase Agreement&#8221;) with Millennium Midstream Partners, L.P. (&#8220;MMP) and the
owners of the partnership interests of MMP (the &#8220;Sellers&#8221;).&#160;&#160;Subject
to the amendment to the Purchase Agreement described below, the description of
the Purchase Agreement included in the Company&#8217;s Current Report on Form 8-K
filed on September 16, 2008 is incorporated herein by reference.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
connection with the completion of the acquisition as discussed in Item 2.01
below, on October 1, 2008, the Purchase Agreement was amended pursuant to
Amendment No. 1 to Partnership Interests Purchase Agreement (the &#8220;Amendment,&#8221;
and collectively with the Purchase Agreement, the &#8220;Amended Purchase Agreement&#8221;)
to, among other things, add any potential damages from Hurricane Ike as a
retained obligation of MMP and the Sellers.&#160;&#160;A copy of the Amended
Purchase Agreement will be filed as an exhibit to a later filing with the
Securities Exchange Commission.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
2.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Completion
of Acquisition or Disposition of Assets.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
October 1, 2008, Eagle Rock completed the previously announced acquisition of
MMP under the terms and conditions of the Amended Purchase
Agreement.&#160;&#160;Pursuant to the terms of the Amended Purchase Agreement,
Eagle Rock acquired all of the outstanding partnership interests of MMP for an
aggregate purchase price of approximately $235.5 million, including working
capital adjustments, subject to customary post-closing purchase price
adjustments, comprised of approximately $180.5 million cash and 4,000,000 Eagle
Rock common units (the &#8220;Acquisition&#8221;).&#160;&#160;Eagle Rock funded the cash
component of the purchase price from existing cash from operations as well as
with borrowings under its existing revolving credit facility, as described in
Item 2.03 below.&#160;&#160;The disclosure set forth above in Item 1.01 of this
Current Report on Form 8-K is hereby incorporated herein by
reference.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">As
previously announced, MMP is in the natural gas gathering and processing
business with its operations located in East Texas, Central Texas and West
Texas.&#160;&#160;The assets controlled by MMP include 260 miles of gathering
pipelines in East Texas, 235 miles of gathering pipelines in Central Texas and
100 miles of gathering pipelines in West Texas.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Eagle
Rock intends to file the Amended Purchase Agreement as an exhibit to a later
filing with the Securities Exchange Commission.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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      2.03</font></div>
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              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Creation
      of a Direct Financial Obligation or an Obligation under an Off-Balance
      Sheet Arrangement of a Registrant.</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
connection with the completion of the Acquisition, on September 29, 2008, Eagle
Rock borrowed approximately $176.4 million under its revolving credit facility
pursuant to the Credit Agreement dated December 13, 2007, as amended, by and
among Eagle Rock, Wachovia Bank, National Association, Bank of America, N.A.,
HSH Nordbank AG, New York Branch, the Royal Bank of Scotland, plc, BNP Paribas
and the other lenders who are parties thereto.&#160;&#160;Much of the amount
borrowed was available under the revolving credit facility as a result of the
exercise by Eagle Rock of the accordion feature in the revolving credit facility
for an additional $180 million in commitments.&#160;&#160;For a further
description of this credit facility, see Eagle Rock&#8217;s Current Report on Form 8-K
filed with the SEC on December 13, 2007 and Current Reports on Form 8-K filed
with the SEC on July 28, 2008 and August 19, 2008 describing the exercise of
$180 million in additional commitments under the accordion feature of this
credit facility.&#160;&#160;The disclosure set forth above in Item 2.01 of this
Current Report on Form 8-K is hereby incorporated herein by
reference.</font></div><br>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
3.02&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Unregistered
Sales of Equity Securities.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
October 1, 2008, pursuant to the Amended Purchase Agreement, Eagle Rock issued
4,000,000 common units of Eagle Rock to the Sellers to fund a portion of the
aggregate purchase price for the Acquisition.&#160;&#160;The common units
accounted for approximately $55 million of the aggregate purchase price, which
equates to a value of $13.75 per common unit.&#160;&#160;The disclosure set
forth above in Item 2.01 of this Current Report on Form 8-K is hereby
incorporated herein by reference.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
common units were not registered under the Securities Act of 1933, as amended
(the &#8220;Act&#8221;) and were issued in reliance upon the exemption from the registration
requirements of the Act provided by Section 4(2) of the Act as a transaction by
an issuer not involving a public offering.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
7.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Regulation
FD Disclosure.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>On October 1, 2008, Eagle Rock issued a
press release relating to the completion of the Acquisition described above in
Item 2.01. A copy of the press release is attached as Exhibit 99.1 to this
Current Report on Form 8-K and is hereby incorporated herein by
reference.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
information set forth in this Item 7.01 and in the attached exhibit are deemed
to be furnished and shall not be deemed to be &#8220;filed&#8221; for the purposes of
Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be
deemed incorporated by reference in any filing under the Securities Act of 1933,
as amended.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
9.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Financial
Statements and Exhibits.</font></div>
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                <div><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)&#160;&#160;</font></div>
              </td>
              <td>
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibits.</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Exhibit
No.</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Description of
Document</font></font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Pursuant to the requirements of the
Securities Exchange Act of 1934, the registrant has duly caused this report to
be signed on its behalf by the undersigned thereunto duly
authorized.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 216pt"></font>EAGLE ROCK ENERGY PARTNERS,
L.P.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 216pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Eagle
Rock Energy GP, L.P., its general partner</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 216pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Eagle
Rock Energy G&amp;P, LLC, its general partner</font></div>
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                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:
      October 1, 2008</font></div>
              </td>
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                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline"> /s/ Joseph A.
      Mills&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
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                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Joseph
      A. Mills</font></div>
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      </font></div>
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              <td style="WIDTH: 166px">&#160;</td>
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                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Chief
      Executive Officer</font></div>
              </td>
            </tr>
        </table>
      </div>
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INDEX</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Exhibit
No.</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Description of
Document</font></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;Press Release
dated October 1, 2008</font></div>
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form8k_100108.htm
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): October 1, 2008 (September 29,
2008)
EAGLE
ROCK ENERGY PARTNERS, L.P.
(Exact
Name of Registrant as Specified in Its Charter)
Delaware
001-33016
68-0629883
(State
      or other jurisdiction of
incorporation
      or organization)
(Commission
File
      Number)
(I.R.S.
      Employer
Identification
      Number)
16701
Greenspoint Park Drive, Suite 200
Houston,
Texas 77060
(Address
of principal executive offices, including zip code)
(281) 408-1200
(Registrant's
telephone number, including area code)
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:
□   Written
communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)
□   Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)
□   Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
240.14d-2(b))
□   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 Definitive Agreement.
As previously disclosed, on September
11, 2008, Eagle Rock Energy Partners, L.P., a Delaware limited partnership
("Eagle Rock"), entered into a Partnership Interests Purchase Agreement (the
"Purchase Agreement") with Millennium Midstream Partners, L.P. ("MMP) and the
owners of the partnership interests of MMP (the "Sellers").  Subject
to the amendment to the Purchase Agreement described below, the description of
the Purchase Agreement included in the Company's Current Report on Form 8-K
filed on September 16, 2008 is incorporated herein by reference.
In
connection with the completion of the acquisition as discussed in Item 2.01
below, on October 1, 2008, the Purchase Agreement was amended pursuant to
Amendment No. 1 to Partnership Interests Purchase Agreement (the "Amendment,"
and collectively with the Purchase Agreement, the "Amended Purchase Agreement")
to, among other things, add any potential damages from Hurricane Ike as a
retained obligation of MMP and the Sellers.  A copy of the Amended
Purchase Agreement will be filed as an exhibit to a later filing with the
Securities Exchange Commission.
Item
2.01.                      Completion
of Acquisition or Disposition of Assets.
On
October 1, 2008, Eagle Rock completed the previously announced acquisition of
MMP under the terms and conditions of the Amended Purchase
Agreement.  Pursuant to the terms of the Amended Purchase Agreement,
Eagle Rock acquired all of the outstanding partnership interests of MMP for an
aggregate purchase price of approximately $235.5 million, including working
capital adjustments, subject to customary post-closing purchase price
adjustments, comprised of approximately $180.5 million cash and 4,000,000 Eagle
Rock common units (the "Acquisition").  Eagle Rock funded the cash
component of the purchase price from existing cash from operations as well as
with borrowings under its existing revolving credit facility, as described in
Item 2.03 below.  The disclosure set forth above in Item 1.01 of this
Current Report on Form 8-K is hereby incorporated herein by
reference.
As
previously announced, MMP is in the natural gas gathering and processing
business with its operations located in East Texas, Central Texas and West
Texas.  The assets controlled by MMP include 260 miles of gathering
pipelines in East Texas, 235 miles of gathering pipelines in Central Texas and
100 miles of gathering pipelines in West Texas.
Eagle
Rock intends to file the Amended Purchase Agreement as an exhibit to a later
filing with the Securities Exchange Commission.
Item
      2.03
Creation
      of a Direct Financial Obligation or an Obligation under an Off-Balance
      Sheet Arrangement of a Registrant.
In
connection with the completion of the Acquisition, on September 29, 2008, Eagle
Rock borrowed approximately $176.4 million under its revolving credit facility
pursuant to the Credit Agreement dated December 13, 2007, as amended, by and
among Eagle Rock, Wachovia Bank, National Association, Bank of America, N.A.,
HSH Nordbank AG, New York Branch, the Royal Bank of Scotland, plc, BNP Paribas
and the other lenders who are parties thereto.  Much of the amount
borrowed was available under the revolving credit facility as a result of the
exercise by Eagle Rock of the accordion feature in the revolving credit facility
for an additional $180 million in commitments.  For a further
description of this credit facility, see Eagle Rock's Current Report on Form 8-K
filed with the SEC on December 13, 2007 and Current Reports on Form 8-K filed
with the SEC on July 28, 2008 and August 19, 2008 describing the exercise of
$180 million in additional commitments under the accordion feature of this
credit facility.  The disclosure set forth above in Item 2.01 of this
Current Report on Form 8-K is hereby incorporated herein by
reference.
Item
3.02                      Unregistered
Sales of Equity Securities.
On
October 1, 2008, pursuant to the Amended Purchase Agreement, Eagle Rock issued
4,000,000 common units of Eagle Rock to the Sellers to fund a portion of the
aggregate purchase price for the Acquisition.  The common units
accounted for approximately $55 million of the aggregate purchase price, which
equates to a value of $13.75 per common unit.  The disclosure set
forth above in Item 2.01 of this Current Report on Form 8-K is hereby
incorporated herein by reference.
The
common units were not registered under the Securities Act of 1933, as amended
(the "Act") and were issued in reliance upon the exemption from the registration
requirements of the Act provided by Section 4(2) of the Act as a transaction by
an issuer not involving a public offering.
Item
7.01.                      Regulation
FD Disclosure.
On October 1, 2008, Eagle Rock issued a
press release relating to the completion of the Acquisition described above in
Item 2.01. A copy of the press release is attached as Exhibit 99.1 to this
Current Report on Form 8-K and is hereby incorporated herein by
reference.
The
information set forth in this Item 7.01 and in the attached exhibit are deemed
to be furnished and shall not be deemed to be "filed" for the purposes of
Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be
deemed incorporated by reference in any filing under the Securities Act of 1933,
as amended.
Item
9.01.                      Financial
Statements and Exhibits.
(d)
Exhibits.
Exhibit
No.
Description of
Document
99.1
Press
      Release dated October 1, 2008.
SIGNATURE
Pursuant to the requirements of the
Securities Exchange Act of 1934, the registrant has duly caused this report to
be signed on its behalf by the undersigned thereunto duly
authorized.
EAGLE ROCK ENERGY PARTNERS,
L.P.
By:           Eagle
Rock Energy GP, L.P., its general partner
By:           Eagle
Rock Energy G&P, LLC, its general partner
Date:
      October 1, 2008
By:
/s/ Joseph A.
      Mills
Joseph
      A. Mills
Chief
      Executive Officer
EXHIBIT
INDEX
Exhibit
No.
Description of
Document
99.1
Press Release
dated October 1, 2008