 SR 27 begins its 90 @-@ mile @-@ long ( 145 km ) route as Grand Avenue and part of the Palouse Scenic Byway at an intersection with US 195 south of Pullman . The highway travels through downtown Pullman and becomes concurrent with SR 270 as it passes west of the Washington State University main campus . Grand Avenue crosses the South Fork Palouse River and leaves the city of Pullman , parallel to a Washington State Department of Transportation ( WSDOT ) rail line as it travels into the Palouse . SR 27 travels northeast to the city of Palouse and crosses the Palouse River before a short concurrency with SR 272 . The highway continues northwest alongside the WSDOT rail line through the town of Garfield and Oakesdale before serving as the southern terminus of SR 271 west of Oakesdale Airport . SR 27 travels northeast and crosses Hangman Creek into Tekoa as Crosby Street before it intersects SR 274 , locally known as Poplar Street , at the north end of the city . The highway turns west onto Poplar Street and travels under a bridge carrying the John Wayne Pioneer Trail before leaving Tekoa and Whitman County for Spokane County . 
