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      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001363032</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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        <issuerCik>0001372020</issuerCik>
        <issuerName>Great Lakes Dredge &amp; Dock CORP</issuerName>
        <secFileNumber>001-33225</secFileNumber>
        <issuerAddress>
          <com:street1>9811 KATY FREEWAY</com:street1>
          <com:street2>SUITE 1200</com:street2>
          <com:city>HOUSTON</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>77024</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(346) 359-1010</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Levenson Ryan</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Former BOD</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>20000</noOfUnitsSold>
        <aggregateMarketValue>180348.57</aggregateMarketValue>
        <noOfUnitsOutstanding>67009319</noOfUnitsOutstanding>
        <approxSaleDate>05/30/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/13/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>20000</amountOfSecuritiesAcquired>
        <paymentDate>05/13/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Ryan J. Levenson</name>
          <address>
            <com:street1>9811 Katy Freeway, Suite 1200,</com:street1>
            <com:city>Houston</com:city>
            <com:stateOrCountry>TX</com:stateOrCountry>
            <com:zipCode>77024</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>05/22/2024</saleDate>
        <amountOfSecuritiesSold>19710</amountOfSecuritiesSold>
        <grossProceeds>182512.36</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Ryan J. Levenson</name>
          <address>
            <com:street1>9811 Katy Freeway, Suite 1200,</com:street1>
            <com:city>Houston</com:city>
            <com:stateOrCountry>TX</com:stateOrCountry>
            <com:zipCode>77024</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>05/23/2024</saleDate>
        <amountOfSecuritiesSold>21160</amountOfSecuritiesSold>
        <grossProceeds>193576.22</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Ryan J. Levenson</name>
          <address>
            <com:street1>9811 Katy Freeway, Suite 1200</com:street1>
            <com:city>Houston,</com:city>
            <com:stateOrCountry>TX</com:stateOrCountry>
            <com:zipCode>77024</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>05/24/2024</saleDate>
        <amountOfSecuritiesSold>25000</amountOfSecuritiesSold>
        <grossProceeds>227590.87</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Ryan J. Levenson</name>
          <address>
            <com:street1>9811 Katy Freeway, Suite 1200</com:street1>
            <com:city>Houston</com:city>
            <com:stateOrCountry>TX</com:stateOrCountry>
            <com:zipCode>77024</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>05/29/2024</saleDate>
        <amountOfSecuritiesSold>15000</amountOfSecuritiesSold>
        <grossProceeds>134762.58</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>05/30/2024</noticeDate>
        <signature>/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Ryan Levenson</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001363032
  XXXXXXXX
  LIVE
  0001372020
  Great Lakes Dredge & Dock CORP
  001-33225
  9811 KATY FREEWAY
  SUITE 1200
  HOUSTON
  TX
  77024
  (346) 359-1010
  Levenson Ryan
  Former BOD
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  20000
  180348.57
  67009319
  05/30/2024
  NASDAQ
  Common
  05/13/2024
  Restricted Stock Vesting
  Issuer
  N
  20000
  05/13/2024
  Compensation
  N
  Ryan J. Levenson
  9811 Katy Freeway, Suite 1200,
  Houston
  TX
  77024
  Common
  05/22/2024
  19710
  182512.36
  Ryan J. Levenson
  9811 Katy Freeway, Suite 1200,
  Houston
  TX
  77024
  Common
  05/23/2024
  21160
  193576.22
  Ryan J. Levenson
  9811 Katy Freeway, Suite 1200
  Houston,
  TX
  77024
  Common
  05/24/2024
  25000
  227590.87
  Ryan J. Levenson
  9811 Katy Freeway, Suite 1200
  Houston
  TX
  77024
  Common
  05/29/2024
  15000
  134762.58
  05/30/2024
  /s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Ryan Levenson