in the
Grand Coulee, heading towards
Coulee City. SR 17 begins at a
diamond interchange with
US 395 southeast of
Mesa in
Franklin County. The highway travels northwest through Mesa, where it crosses over a
BNSF rail line and runs through
Esquatzel Coulee before intersecting the terminus of
SR 260 west of
Connell in the Paradise Flats. SR 17 travels east of
Scooteney Reservoir and northwest into
Adams County before intersecting
SR 26 in a diamond interchange east of
Othello. The highway continues north into
Grant County as the
Coulee Corridor Scenic Byway and travels over the
Columbia Basin Railroad into rural Adams County. The roadway serves as the western terminus of
SR 170 and the eastern terminus of
SR 262 west of
Warden before continuing northwest towards
Moses Lake. SR 17 travels into the city of Moses Lake and intersects
I-90 in a
partial cloverleaf interchange, serving as the eastern terminus of
I-90 Business and its
concurrency with SR 17. The roadway expands to four lanes and turns north at Pioneer Way, where I-90 Business leaves the concurrency and travels into Downtown Moses Lake. SR 17 heads around Moses Lake and turn northwest onto a
limited-access highway after an intersection with Broadway Avenue, signed as the northern terminus of
SR 171. The limited-access highway intersects Stratford Road in a diamond interchange north of the city and heads northwest along
Moses Lake through
Moses Lake North, passing south of
Grant County International Airport. SR 17 crosses
Rocky Ford Creek and intersects
SR 282 east of
Ephrata in rural Grant County. The highway continues north and passes
Ephrata Municipal Airport before it intersects
SR 28 in
Soap Lake. SR 17 and the Coulee Corridor Scenic Byway continue northwest through the
Grand Coulee and passing several lakes, including
Soap Lake,
Lake Lenore and
Alkali Lake. The highway turns northeast onto the west shores of
Blue Lake and
Park Lake, and passes the Blue Lake
rest area. The roadway enters
Sun Lakes State Park and passes
Dry Falls at the north end of the Grand Coulee. SR 17 intersects
US 2, the continuation of the Coulee Corridor Scenic Byway, carries SR 17 into
Okanogan County and the
Colville Indian Reservation, west of
Bridgeport State Park. The highway continues north along the east bank of the Columbia River before passing through
Fort Okanogan and ending at an intersection with
US 97 east of
Brewster near the confluence of the Columbia and
Okanogan rivers. SR 17 between Mesa and the Moses Lake area is designated as part of the
National Highway System, which includes roadways important to the national economy, defense, and mobility; and as part of WSDOT's Highways of Statewide Significance, which includes highways that connect major communities in the
state of Washington. ==History==