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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001209191-11-010326.txt : 20110216
<SEC-HEADER>0001209191-11-010326.hdr.sgml : 20110216
<ACCEPTANCE-DATETIME>20110216190514
ACCESSION NUMBER:		0001209191-11-010326
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110215
FILED AS OF DATE:		20110216
DATE AS OF CHANGE:		20110216

ISSUER:		

	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

	BUSINESS ADDRESS:	
		STREET 1:		THE WEDGE TOWER
		STREET 2:		1415 LOUISIANA STREET, SUITE 2700
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
		BUSINESS PHONE:		281-408-1200

	MAIL ADDRESS:	
		STREET 1:		P.O. BOX 2968
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77252

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Eagle Rock Energy Partners, L.P.
		DATE OF NAME CHANGE:	20060531

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Eagle Rock Holdings, L.P.
		CENTRAL INDEX KEY:			0001377257
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618942

	BUSINESS ADDRESS:	
		STREET 1:		THE WEDGE TOWER
		STREET 2:		1415 LOUISIANA STREET, SUITE 2700
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
		BUSINESS PHONE:		281-408-1200

	MAIL ADDRESS:	
		STREET 1:		P.O. BOX 2968
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77252

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Natural Gas Partners VIII, L.P.
		CENTRAL INDEX KEY:			0001377291
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618937

	BUSINESS ADDRESS:	
		STREET 1:		125 E. JOHN CARPENTER FWY
		STREET 2:		SUITE 600
		CITY:			IRVING
		STATE:			TX
		ZIP:			75062
		BUSINESS PHONE:		972.432.1440

	MAIL ADDRESS:	
		STREET 1:		125 E. JOHN CARPENTER FWY
		STREET 2:		SUITE 600
		CITY:			IRVING
		STATE:			TX
		ZIP:			75062

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Natural Gas Partners VII, L.P.
		CENTRAL INDEX KEY:			0001377292
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618938

	BUSINESS ADDRESS:	
		STREET 1:		125 E. JOHN CARPENTER FWY
		STREET 2:		SUITE 600
		CITY:			IRVING
		STATE:			TX
		ZIP:			75062
		BUSINESS PHONE:		972.432.1440

	MAIL ADDRESS:	
		STREET 1:		125 E. JOHN CARPENTER FWY
		STREET 2:		SUITE 600
		CITY:			IRVING
		STATE:			TX
		ZIP:			75062

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Eagle Rock GP, LLC
		CENTRAL INDEX KEY:			0001378412
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618941

	BUSINESS ADDRESS:	
		STREET 1:		THE WEDGE TOWER
		STREET 2:		1415 LOUISIANA STREET, SUITE 2700
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
		BUSINESS PHONE:		281-408-1200

	MAIL ADDRESS:	
		STREET 1:		P.O. BOX 2968
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77252-2968

	FORMER NAME:	
		FORMER CONFORMED NAME:	Eagle Rock Energy GP, LLC
		DATE OF NAME CHANGE:	20061017

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Montierra Management LLC
		CENTRAL INDEX KEY:			0001398059
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618939

	BUSINESS ADDRESS:	
		STREET 1:		24 GREENWAY PLAZA, SUITE 450
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77046
		BUSINESS PHONE:		713-843-7500

	MAIL ADDRESS:	
		STREET 1:		24 GREENWAY PLAZA, SUITE 450
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77046

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Montierra Minerals & Production, L.P.
		CENTRAL INDEX KEY:			0001398061
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618940

	BUSINESS ADDRESS:	
		STREET 1:		24 GREENWAY PLAZA, SUITE 450
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77046
		BUSINESS PHONE:		713-843-7500

	MAIL ADDRESS:	
		STREET 1:		24 GREENWAY PLAZA, SUITE 450
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77046

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			NGP Income Management, L.L.C.
		CENTRAL INDEX KEY:			0001398062
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33016
		FILM NUMBER:		11618936

	BUSINESS ADDRESS:	
		STREET 1:		125 E. JOHN CARPENTER FREEWAY, SUITE 600
		CITY:			IRVING
		STATE:			TX
		ZIP:			75062
		BUSINESS PHONE:		972-432-1400

	MAIL ADDRESS:	
		STREET 1:		125 E. JOHN CARPENTER FREEWAY, SUITE 600
		CITY:			IRVING
		STATE:			TX
		ZIP:			75062
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c12737_4x0.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-02-15</periodOfReport>

    <issuer>
        <issuerCik>0001364541</issuerCik>
        <issuerName>EAGLE ROCK ENERGY PARTNERS L P</issuerName>
        <issuerTradingSymbol>EROC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001377257</rptOwnerCik>
            <rptOwnerName>Eagle Rock Holdings, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>EAGLE ROCK ENERGY PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>1415 LOUISIANA STREET, SUITE 2700</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001378412</rptOwnerCik>
            <rptOwnerName>Eagle Rock GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>EAGLE ROCK ENERGY PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>1415 LOUISIANA STREET, SUITE 2700</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001398061</rptOwnerCik>
            <rptOwnerName>Montierra Minerals &amp; Production, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>24 GREENWAY PLAZA, SUITE 450</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77046</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001398059</rptOwnerCik>
            <rptOwnerName>Montierra Management LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>24 GREENWAY PLAZA, SUITE 450</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77046</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001377292</rptOwnerCik>
            <rptOwnerName>Natural Gas Partners VII, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 E. JOHN CARPENTER FREEWAY, SUITE 600</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVING</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75062</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001377291</rptOwnerCik>
            <rptOwnerName>Natural Gas Partners VIII, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 E. JOHN CARPENTER FREEWAY, SUITE 600</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVING</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75062</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001398062</rptOwnerCik>
            <rptOwnerName>NGP Income Management, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 E. JOHN CARPENTER FREEWAY, SUITE 600</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVING</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75062</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2011-02-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3066886</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-08-15</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2012-05-15</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3066886</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F8"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2011-02-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>770824</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-08-15</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2012-05-15</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>770824</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3222319</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F8"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2011-02-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1507669</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-08-15</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2012-05-15</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1507669</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4729988</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F6"/>
                    <footnoteId id="F8"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2011-02-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>248562</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-08-15</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2012-05-15</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>248562</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4978550</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pro rata distribution for no consideration by Eagle Rock Holdings, L.P. (&quot;Holdings&quot;) to each of its partners of warrants for common units of Eagle Rock Energy Partners, L.P.</footnote>
        <footnote id="F2">Warrants are only exercisable on each of August 15, 2010, November 15, 2010, March 15, 2011, May 15, 2011, August 15, 2011, November 15, 2011, March 15, 2012 and May 15, 2012. The warrants are freely tradable until May 15, 2012.</footnote>
        <footnote id="F3">Reflects the pro rata distribution for no consideration by Holdings to each of its partners of warrants for common units of Eagle Rock Energy Partners, L.P.</footnote>
        <footnote id="F4">Natural Gas Partners VII, L.P. (&quot;NGP VII&quot;) and Natural Gas Partners VIII, L.P. (&quot;NGP VIII&quot;) collectively indirectly own a majority of the LP interest in Holdings and indirectly control the general partner of Holdings. NGP VII owns a majority of the LP interest in Montierra Minerals &amp; Production, L.P. (&quot;Montierra Minerals&quot;) and controls the general partner of Montierra Minerals. NGP VII is the sole member of NGP Income Management, L.L.C.</footnote>
        <footnote id="F5">Represents 770,824 warrants received by Eagle Rock Holdings NGP 7, LLC as a result of the pro rata distribution by Holdings to each of its partners. Eagle Rock Holdings NGP 7, LLC is a wholly owned subsidiary of NGP VII.</footnote>
        <footnote id="F6">Represents 1,507,669 warrants received by Eagle Rock Holdings NGP 8, LLC as a result of the pro rata distribution by Holdings to each of its partners. Eagle Rock Holdings NGP 8, LLC is a wholly owned subsidiary of NGP VIII.</footnote>
        <footnote id="F7">Represents 248,562 warrants received by Montierra Minerals as a result of the pro rata distribution by Eagle Rock Holdings, L.P. to each of its partners. Montierra Management LLC is the general partner of Montierra Minerals.</footnote>
        <footnote id="F8">The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interests therein, and this report shall not be deemed an admission that the reporting persons are the beneficial owners of the reported securities for purposes of Section 16 or for any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Eagle Rock Holdings, L.P., By its general partner, Eagle Rock GP, L.L.C., By /s/ Kenneth A. Hersh, Kenneth A. Hersh, Manager</signatureName>
        <signatureDate>2011-02-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Eagle Rock GP, L.L.C., By /s/ Kenneth A. Hersh, Kenneth A. Hersh, Manager</signatureName>
        <signatureDate>2011-02-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Montierra Minerals &amp; Production, L.P., By its general partner, Montierra Management LLC, By /s/ Joseph A. Mills, Chief Executive Officer</signatureName>
        <signatureDate>2011-02-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Montierra Management LLC, By /s/ Joseph A. Mills, Chief Executive Officer</signatureName>
        <signatureDate>2011-02-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Natural Gas Partners VII, L.P., By its general partner, G.F.W. Energy VII, L.P., By its general partner, GFW VII, L.L.C., By /s/ Kenneth A. Hersh, Kenneth A. Hersh, Authorized Member</signatureName>
        <signatureDate>2011-02-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Natural Gas Partners VIII, L.P., By its general partner, G.F.W. Energy VIII, L.P., By its general partner, GFW VIII, L.L.C., By /s/ Kenneth A. Hersh, Kenneth A. Hersh, Authorized Member</signatureName>
        <signatureDate>2011-02-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>NGP Income Management, L.L.C., By /s/ Tony R. Weber, Tony R. Weber, President</signatureName>
        <signatureDate>2011-02-16</signatureDate>
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</ownershipDocument>
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-----END PRIVACY-ENHANCED MESSAGE-----