SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

MILLS JOSEPH A

(Last)

(First)

(Middle)

16701 GREENSPOINT PARK DRIVE

SUITE 200

(Street)

HOUSTON

77060

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
04/30/2007

3. Issuer Name and Ticker or Trading Symbol
EAGLE ROCK ENERGY PARTNERS L P [ eroc ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	CEO and Chairman

5. If Amendment, Date of Original Filed (Month/Day/Year)

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Units representing limited partner interests	69,185	I⁽¹⁾⁽²⁾	See Notes (1) and (2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

1. On April 30, 2007, Montierra Minerals & Production, L.P. ("Montierra") completed a transaction with the Issuer in which it received 2,820,578 common units. Montierra Management, LLC ("Management"), the general partner of Montierra, separately received in the transaction 28,491 common units. The reporting person owns 2.404% of Montierra and, thus, indirectly owns 67,806 common units through his ownership in Montierra. The reporting person owns 2.439% of Management and, thus indirectly owns 694 common units through his ownership in Management, and because Management owns 0.996% of Montierra, the reporting person also indirectly owns an addtional 685 common units through his ownership in Management.

2. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the reported securities for purposes of Section 16 or for any other purpose.

	Joseph A. Mills	05/10/2007
	** 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 5 (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).
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