 After it descends the mountains , US 12 intersects SR 410 ( formerly US 410 ) west of Naches , which serves Chinook Pass , Cayuse Pass , and the White River entrance of Mount Rainier National Park . East of Naches , US 12 widens once again to four lanes as it approaches the city of Yakima . There , it has an interchange with I @-@ 82 and US 97 at exit 31 . US 12 then runs concurrently with I @-@ 82 , bypassing the towns of Toppenish and Prosser and paralleling the Yakima River , until exit 102 near the Tri @-@ Cities . At exit 102 , it meets the western terminus of Interstate 182 . US 12 and I @-@ 182 then run concurrently east over Goose Gap and through the Tri @-@ Cites . In Pasco , I @-@ 182 ends , and US 12 intersects US 395 . 
