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                <filerCredentials>
                    <cik>0001292085</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001372020</issuerCik>
            <issuerName>GREAT LAKES DREDGE &amp; DOCK COMPANY</issuerName>
            <secFileNumber>001-33225</secFileNumber>
            <issuerAddress>
                <ns2:street1>9811 Katy Freeway,</ns2:street1>
                <ns2:city>Houston,</ns2:city>
                <ns2:stateOrCountry>TX</ns2:stateOrCountry>
                <ns2:zipCode>77024</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>346-359-1010</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>KATHLEEN SHANAHAN FAMILY TRUST</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>23238</noOfUnitsSold>
            <aggregateMarketValue>293541.30</aggregateMarketValue>
            <noOfUnitsOutstanding>67272067</noOfUnitsOutstanding>
            <approxSaleDate>11/11/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>12/31/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1623</amountOfSecuritiesAcquired>
            <paymentDate>12/31/2020</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>06/28/2019</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3645</amountOfSecuritiesAcquired>
            <paymentDate>06/28/2019</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/30/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1326</amountOfSecuritiesAcquired>
            <paymentDate>06/30/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/31/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2658</amountOfSecuritiesAcquired>
            <paymentDate>03/31/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>12/31/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1233</amountOfSecuritiesAcquired>
            <paymentDate>12/31/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/31/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1426</amountOfSecuritiesAcquired>
            <paymentDate>03/31/2022</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>06/30/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1526</amountOfSecuritiesAcquired>
            <paymentDate>06/30/2022</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>06/28/2019</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3876</amountOfSecuritiesAcquired>
            <paymentDate>06/28/2019</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>12/31/2019</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3575</amountOfSecuritiesAcquired>
            <paymentDate>12/31/2019</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>09/30/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2248</amountOfSecuritiesAcquired>
            <paymentDate>09/30/2020</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>06/30/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>102</amountOfSecuritiesAcquired>
            <paymentDate>06/30/2020</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>11/11/2024</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Kathleen Marie Shanahan, Trustee</signature>
        </noticeSignature>
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144
0001292085
XXXXXXXX
LIVE
0001372020
GREAT LAKES DREDGE & DOCK COMPANY
001-33225
9811 Katy Freeway,
Houston,
TX
77024
346-359-1010
KATHLEEN SHANAHAN FAMILY TRUST
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
23238
293541.30
67272067
11/11/2024
NASDAQ
Common
12/31/2020
Restricted stock vesting under a registered plan
Issuer
N
1623
12/31/2020
Services Rendered
common
06/28/2019
Restricted stock vesting under a registered plan
issuer
N
3645
06/28/2019
Services Rendered
Common
06/30/2021
Restricted stock vesting under a registered plan
Issuer
N
1326
06/30/2021
Services Rendered
Common
03/31/2021
Restricted stock vesting under a registered plan
Issuer
N
2658
03/31/2021
Services Rendered
common
12/31/2021
Restricted stock vesting under a registered plan
issuer
N
1233
12/31/2021
Services Rendered
common
03/31/2022
Restricted stock vesting under a registered plan
issuer
N
1426
03/31/2022
Services Rendered
common
06/30/2022
Restricted stock vesting under a registered plan
issuer
N
1526
06/30/2022
Services Rendered
common
06/28/2019
Restricted stock vesting under a registered plan
issuer
N
3876
06/28/2019
Services Rendered
common
12/31/2019
Restricted stock vesting under a registered plan
issuer
N
3575
12/31/2019
Services Rendered
common
09/30/2020
Restricted stock vesting under a registered plan
issuer
N
2248
09/30/2020
Services Rendered
common
06/30/2020
Restricted stock vesting under a registered plan
issuer
N
102
06/30/2020
Services Rendered
Y
11/11/2024
/s/ Kathleen Marie Shanahan, Trustee