About
Palouse Regional Transportation Planning Organization
PRTPO is a four-county RTPO covering all of Asotin, Columbia, Garfield, and Whitman counties. The cities of Asotin and Clarkston, and urbanized areas of Asotin County are part of the Lewis-Clark Valley bi-state federal metropolitan planning area that also includes Lewiston and urban portions of Nez Perce County in Idaho. PRTPO is located within the Eastern Region and the South Central Region of the WSDOT.
Learn More About Your County & City Plans
If your county or city has this asterisk next to it, it's still growing! Some areas in our state partner with their regional planning agency to build their transportation plan.
