State Route 21, 22 and 23 in Washington

State Route 21 in Washington

Get started kahlotus
End Danville (CDN)
Length 191 mi
Length 308 km





State Route 21 or SR-21 is a state route in the U.S. state of Washington. The road forms a north-south route in the east of the state, from Kahlotus to Danville. The 308 kilometer long route has a secondary importance and has a ferry service.

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Travel directions

The Keller Ferry across Franklin D. Roosevelt Lake.

State Route 21 begins in the village of Kahlotus, a remote place in the vast steppes interrupted by canyons. The road heads north across the plains and joins US 395 at Lind. The road then passes through Lind and crosses Interstate 90 further north in an uninhabited area, about 75 miles west of Spokane. The road continues north through the sparsely populated steppes and rangelands of eastern Washington, with limited elevation changes in this area. In the village of Wilbur you cross the US 2.

Further north you reach the valley of the Columbia River, which is dammed here by Franklin D. Roosevelt Lake. There is a ferry service across this reservoir. Farther north, the terrain is considerably more mountainous, State Route 21 winds north through a sparsely populated valley, flanked by mountain ranges, the highest peaks of which reach approximately 2,100 meters. The road leads through spectacular scenery with mountains, rocks and forest. There are hardly any places on a long stretch of State Route 21, the only place worth mentioning is Republic, where one crosses State Route 20. The road then follows the Kettle River valley north to the Canadian border at Danville. On the British Columbia side, Highway 41on to Grand Forks.

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State Route 21 follows the historic Marble Mountain Road, a wagon road opened in 1899 between the Columbia River and Republic. In 1905 this was renumbered as State Route 4. Around 1915 the road opened from Republic to the border with Canada. When the primary and secondary state highways were introduced in 1937, the route was numbered State Route 4 between Wilbur and the border with Canada at Danville. With the renumbering of 1964, today’s State Route 21 was created.

The Keller Ferry has been used to cross the Columbia River since the late 1800s. Between 1933 and 1942, the Grand Coulee Dam was constructed, one of the largest dams in North America and the largest hydroelectric power station in the United States. This created the Franklin D. Roosevelt Lake. No bridge was built, the Keller Ferry survived after the creation of the reservoir.

Traffic intensities

State Route 21 is characterized by very little use. On the southern route, usually only 100 to 200 vehicles drive per day, in the mountains it is slightly higher, but almost nowhere does it exceed 1,000 vehicles per day.

State Route 22 in Washington

Get started Zillah
End prosser
Length 36 mi
Length 58 km



State Route 22 or SR-22 is a state route in the U.S. state of Washington. The road forms an east-west route in the Yakima River valley in the southeastern part of the state, between Zillah and Prosser. State Route 22 is 58 kilometers long.

Travel directions

State Route 22 connects through the Yakima River valley, some distance parallel to Interstate 82, where the road also begins and ends. The road usually leads through flat, agricultural areas, through a few towns on the route. The eastern part at Prosser runs along a high bare mountain ridge.


The road was built in the 1920-1930s to connect the agricultural lands around the Yakima River. This was a fertile region in the barren steppe of eastern Washington. In 1939 the road was numbered Secondary State Highway 3A. In 1964, the road was numbered State Route 22. However, the road was of little importance because US 12 also ran in the same valley, which was later replaced by the construction of Interstate 82 between Yakima and the Tri-Cities.

Traffic intensities

9,000 vehicles drive daily between Zillah and Toppenish and approximately 2,000 vehicles between Toppenish and Prosser.

State Route 23 in Washington

Get started steptoe
End Harrington
Length 66 mi
Length 106 km


State Route 23 or SR-23 is a state route in the U.S. state of Washington. The road forms an east-west route in the east of the state, from Steptoe to Harrington for a distance of 106 kilometers.

Travel directions

State Route 23 at Steptoe.

The road begins in the hamlet of Steptoe on US 195, 70 miles south of Spokane. The road then runs as a secondary connection in a northwesterly direction over the rolling steppe. The main place on the route is the village of Sprague, which also has a connection to Interstate 90, 60 kilometers southwest of Spokane. State Route 23 then continues and ends in Harrington on State Route 28.


Built in the 1920s, the road was numbered in 1937 as Secondary State Highway 11C between Steptoe and Sprague and Secondary State Highway 11F between Sprague and Harrington. The section between Steptoe and Sprague lost its status as a state highway in 1951. However, with the renumbering of 1964, the road came back within the state highway system, this time as State Route 23. The reactivation of the road as a state highway probably had to do with the fact that it connected to I-90 at Sprague. got.

Traffic intensities

State Route 23 is a very light road, with only 200 vehicles per day on most of the route.

State Route 23 in Washington