FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Montierra Minerals & Production, L.P. 		2. Issuer Name and Ticker or Trading Symbol

EAGLE ROCK ENERGY PARTNERS L P [ EROC ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O EAGLE ROCK ENERGY PARTNERS, L.P., 1415 LOUISIANA STREET, SUITE 2700 		3. Date of Earliest Transaction (MM/DD/YYYY)

3/15/2012
(Street)

HOUSTON, TX 77002
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Units Representing Limited Partner Interest   3/15/2012     X (1)    200000   A $6   51112685   D   (1) (2) (3)  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Warrants   $6   3/15/2012     X         200000   (1)   8/15/2010   5/15/2012   Common Units Representing Limited Partner Interest   200000   (1) $ 0   288635   D    

Explanation of Responses:
( 1)  Represents the exercise of warrants to purchase 200,000 common units representing limited partner interests by Montierra Minerals & Production, L.P. Natural Gas Partners VII, L.P. ("NGP VII") owns a majority of the LP interest in Montierra Minerals & Production, L.P. and controls its general partner, Montierra Management LLC.
( 2)  Kenneth A. Hersh may be deemed to share dispositive power over the units held directly or indirectly by NGP VII, thus, he may also be deemed to be the beneficial owner of these units. This report is filed in connection with the Form 4 filed today by Kenneth A. Hersh.
( 3)  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.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Montierra Minerals & Production, L.P.
C/O EAGLE ROCK ENERGY PARTNERS, L.P.
1415 LOUISIANA STREET, SUITE 2700
HOUSTON, TX 77002
X

Natural Gas Partners VII, L.P.
125 E. JOHN CARPENTER FREEWAY
SUITE 600
IRVING, TX 75062
X


Signatures
Montierra Minerals & Production, L.P., By its general partner, Montierra Management LLC, By /s/ Joseph A. Mills, Chief Executive Officer 3/15/2012
** Signature of Reporting Person Date

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, Authorized Member 3/15/2012
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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