POWER OF ATTORNEY

               The undersigned hereby constitutes and appoints each of Kelly J. Jameson, William G.
Manias, Eric Guy, and Wanda E. Murphy, or either of them signing singly, and with full power of
substitution, the undersigned's true and lawful attorney-in-fact to:

(1)        prepare, execute in the undersigned's name and on the undersigned's behalf, and
submit to the U.S. Securities and Exchange Commission (the "SEC") a Form ID,
including amendments thereto, and any other documents necessary or appropriate
to obtain codes and passwords enabling the undersigned to make electronic filings
with the SEC of reports required by Section 16(a) of the Securities Exchange Act of
1934 or any rule or regulation of the SEC;

(2) execute for and on behalf of the undersigned, in the undersigned's capacity as an
officer and/or director of Crestwood Gas Services GP LLC, in its capacity as the
general partner of Crestwood Midstream Partners LP, Forms 3, 4, and 5 in
accordance with Section 16(a) of the Securities Exchange Act of 1934 and the
rules thereunder;

(3) do and perform any and all acts for and on behalf of the undersigned which may be
necessary or desirable to complete and execute any such Form 3, 4, or 5,
complete and execute any amendment or amendments thereto, and timely file
such form with the SEC and any stock exchange or similar authority; and

(4)        take any other action of any type whatsoever in connection with the foregoing
which, in the opinion of such attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the undersigned, it being understood that the
documents executed by such attorney-in-fact on behalf of the undersigned
pursuant to this power of attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in such attorney-in-
fact's discretion.

               The undersigned hereby grants to each such attorney-in-fact full power and authority to do
and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in
the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as
the undersigned might or could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights
and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming, nor are Crestwood
Gas Services GP LLC or Crestwood Midstream Partners LP assuming, any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act of 1934.

       The execution by the undersigned of this power of attorney expressly revokes and
terminates any power of attorney previously granted by the undersigned relating to Forms 3, 4, and
5 with respect to securities issued by Crestwood Midstream Partners LP. This power of attorney
shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and
5 with respect to the undersigned's holdings of and transactions in securities issued by the
Crestwood Midstream Partners LP, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

               IN WITNESS WHEREOF, the undersigned has caused this power of attorney to be
executed as of December 8, 2010.

        /s/ Timothy H. Day
                                                          Timothy H. Day

DAY TIMOTHY H 4