-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 Nz9tN1rDPosM7DMDI38e2A==

<SEC-DOCUMENT>0001364541-08-000037.txt : 20081014
<SEC-HEADER>0001364541-08-000037.hdr.sgml : 20081013
<ACCEPTANCE-DATETIME>20081010203756
ACCESSION NUMBER:		0001364541-08-000037
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20081014
DATE AS OF CHANGE:		20081010
EFFECTIVENESS DATE:		20081014

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EAGLE ROCK ENERGY PARTNERS L P
		CENTRAL INDEX KEY:			0001364541
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				680629883
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-103675
		FILM NUMBER:		081119403

	BUSINESS ADDRESS:	
		STREET 1:		16701 GREENSPOINT PARK DRIVE
		STREET 2:		SUITE 200
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77060
		BUSINESS PHONE:		281-408-1200

	MAIL ADDRESS:	
		STREET 1:		16701 GREENSPOINT PARK DRIVE
		STREET 2:		SUITE 200
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77060

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Eagle Rock Energy Partners, L.P.
		DATE OF NAME CHANGE:	20060531
</SEC-HEADER>
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<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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    <schemaVersion>X0101</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001364541</cik>
        <entityName>EAGLE ROCK ENERGY PARTNERS L P</entityName>
        <issuerAddress>
            <street1>16701 GREENSPOINT PARK DRIVE</street1>
            <street2>SUITE 200</street2>
            <city>HOUSTON</city>
            <stateOrCountry>TX</stateOrCountry>
            <zipCode>77060</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>281-408-1200</issuerPhoneNumber>
        <issuerPreviousNameList>
            <previousName>Eagle Rock Energy Partners, L.P.</previousName>
        </issuerPreviousNameList>
        <jurisdictionOfInc>DE</jurisdictionOfInc>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2006</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Joseph</firstName>
                <middleName></middleName>
                <lastName>Mills</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer and Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kenneth</firstName>
                <middleName></middleName>
                <lastName>Hersh</lastName>
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            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName></middleName>
                <lastName>Quinn</lastName>
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            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
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            <relationshipClarification>Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Philip</firstName>
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            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
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            <relatedPersonRelationshipList>
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            <relationshipClarification>Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName></middleName>
                <lastName>Smith</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName></middleName>
                <lastName>Weinzierl</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName></middleName>
                <lastName>White</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Alfredo</firstName>
                <middleName></middleName>
                <lastName>Garcia</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Charles</firstName>
                <middleName></middleName>
                <lastName>Boettcher</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Steven</firstName>
                <middleName></middleName>
                <lastName>Hendrickson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Joseph</firstName>
                <middleName></middleName>
                <lastName>Schimelpfening</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName></middleName>
                <lastName>Puckett</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16701 Greenspoint Park Drive</street1>
                <street2>Suite 200</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77060</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Eagle Rock Energy G&amp;P, LLC, the general partner of the general partner to issuer.</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Oil and Gas</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Over $100,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2008-10-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>true</isBusinessCombinationTransaction>
            <clarificationOfResponse>Issuance as part consideration for the acquisition of all outstanding units of Millennium Midstream Partners, L.P.</clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>55000000</totalOfferingAmount>
            <totalAmountSold>55000000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse>Issuance as part consideration for the acquisition of all outstanding units of Millennium Midstream Partners, L.P.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>9</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>EAGLE ROCK ENERGY PARTNERS L P</issuerName>
                <signatureName>/s/ Charles C. Boettcher</signatureName>
                <nameOfSigner>Charles C. Boettcher</nameOfSigner>
                <signatureTitle>Senior VP of general partner of general partner of issuer</signatureTitle>
                <signatureDate>2008-10-10</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----