 State Route 231 ( SR 231 ) begins at SR 23 0 @.@ 79 miles ( 1 @.@ 27 km ) north of Sprague and a diamond interchange with Interstate 90 ( I @-@ 90 ) , co @-@ signed as U.S. Route 395 ( US 395 ) . SR 23 is the " parent " or main route of SR 231 and travels northwest to Harrington and south to Downtown Sprague , spanning 66 @.@ 00 miles ( 106 @.@ 22 km ) , 8 @.@ 97 miles ( 14 @.@ 44 km ) shorter than SR 231 . Traveling northeast , the highway traverses a hill and cliff , passing Browns Lake , and turns west . The direction of the roadway becomes north through a narrow valley and SR 231 arrives in Edwall as Oregon Street . The roadway briefly turns east as Main Street before crossing a BNSF Railway line and continuing northeast alongside the tracks . After turning north into the plains , the highway parallels Crab Creek to intersect US 2 west of Reardan . 
