Exhibit 3.17

CERTIFICATE OF FORMATION

OF

POTLATCH TIMBERLANDS, LLC

1. Name. The name of the limited liability company formed hereby is Potlatch Timberlands, LLC (the “LLC”).

2. Registered Office and Registered Agent. The address of the registered office of the LLC required to be maintained in the state of Delaware by Section 18-104 of the Delaware Limited Liability Company Act, is: 1209 Orange Street, Wilmington, DE 19801. The name of its registered agent at such address is The Corporation Trust Company.

3. Effective Date. This Certificate of Formation shall be effective upon its filing with the Delaware Secretary of State.

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation as of the 25^th day of March, 2009.

By:	Potlatch Forest Holdings, Inc., sole member
By:	/s/ Pamela Mull
	Pamela Mull, Vice President, General Counsel
	and Corporate Secretary