LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS

Know by all these presents, that the undersigned hereby makes,
constitutes and appoints each of Peter A. Dea, John C. Walter,
William J. Krysiak and Fiona E. Arnold, each acting individually,
as the undersigned's true and lawful attorney-in-fact, with full
power and authority as hereinafter described on behalf of and in
the name, place and stead of the undersigned to:
(1) prepare, execute, acknowledge, deliver and file Forms 3, 4 and 5
(including any amendments thereto) with respect to the securities of
Western Gas Resources, Inc., a Delaware corporation (the "Company"),
with the United States Securities and Exchange Commission, any national
securities exchanges and the Company, as considered necessary or
advisable under Section 16(a) of the Securities Exchange Act of
1934 and the rules and regulations promulgated thereunder,
as amended from time to time (the "Exchange Act");
(2) seek or obtain, as the undersigned's representative and
on the undersigned's behalf, information on transactions in
the Company's securities from any third party, including brokers,
employee benefit plan administrators and trustees, and the
undersigned hereby authorizes any such person to release any
such information to the undersigned and approves and ratifies
any such release of information; and
(3) perform any and all other acts which in the discretion of
such attorney-in-fact are necessary or desirable for and on
behalf of the undersigned in connection with the foregoing.
The undersigned acknowledges that:
(1) this Power of Attorney authorizes, but does not require,
each such attorney-in-fact to act in their discretion on information
provided to such attorney-in-fact without independent verification
of such information;
(2) any documents prepared and/or executed by either such
attorney-in-fact on behalf of the undersigned pursuant to this
Power of Attorney will be in such form and will contain such
information and disclosure as such attorney-in-fact, in his or
her discretion, deems necessary or desirable;
(3) neither the Company nor either of such attorneys-in-fact
assumes (i) any liability for the undersigned's responsibility to
comply with the requirement of the Exchange Act, (ii) any
liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability of the undersigned
for profit disgorgement under Section 16(b) of the Exchange Act; and
(4) this Power of Attorney does not relieve the undersigned
from responsibility for compliance with the undersigned's
obligations under the Exchange Act, including without limitation
the reporting requirements under Section 16 of the Exchange Act.
The undersigned hereby gives and grants each of the foregoing
attorneys-in-fact full power and authority to do and perform
all and every act and thing whatsoever requisite, necessary or
appropriate to be done in and about the foregoing matters as fully
to all intents and purposes as the undersigned might or could do
if present, hereby ratifying all that each such attorney-in-fact
of, for and on behalf of the undersigned, shall lawfully do or cause
to be done by virtue of this Limited Power of Attorney.
This Power of Attorney shall remain in full force and effect until
revoked by the undersigned in a signed writing delivered to
each such attorney-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 24th day of February, 2006.

/s/ Paul G. Gagnon
Signature

Paul G. Gagnon
Print Name