County Transportation Metrics is a project of the Washington State Association of Counties (WSAC) and will provide a roadmap for setting transportation priorities.

Asotin County

Founded in 1883, Asotin County is located in southeastern Washington. Today (2011) its population is roughly 21,650. The sixth smallest county in the state, Asotin County includes rich agricultural regions as well a rugged terrain. The county seat is in Asotin.

Before white exploration and settlement, the semi-nomadic Nez Perce inhabited the area. The Nez Perce Trail was a key to commerce. Today, highways largely parallel the old trail. The term "Asotin” derives from a Nez Perce word meaning "Eel Creek”.

Economically, the area has had a very strong agricultural base, focused on farming and fruit orchards. Clarkston, the largest city in the county, grew significantly when the Lewiston-Clarkston Bridge opened in 1899, connecting the area to Lewiston Idaho. The completion of the Lower Granite Dam in 1975 created the furthest inland water route in the nation and made port activity at Clarkston-Lewiston an important economic factor.

Recently, non-agricultural jobs have increased significantly largely due to a Wal-Mart opening in Clarkston. This has had a positive impact on local sales tax revenues. A new wind farm being built in neighboring Garfield County and other farms in Columbia and Whitman Counties are also employing Asotin County residents.  Agriculture is essential to the economic health of the county, but does not employ a large proportion of residents.

Population (OFM Databook, 2011)

Population (2011) 21,650
Population Change (2000 to 2010)      5.2%
Land Area (Sq. Mi.) 636.21
Density (Population/Sq. Mi.) 34.03



Major Highways

  • US Route 12

County Roads (CRAB and OFM, 2011)

Total Center Lane Miles
Maintenance Expenditures
$ 1,878,877
Preservation Expenditures
$ 1,209,014
Improvement Expenditures

County Revenues  & Expenditures (OFM Databook, 2011)

Total Revenues
$ 23,034,407
Total Expenditures
$ 21,066,752
Transportation Expenditures
$ 3,131,712


Performance Measures

Links & Sources

Washington State Association of Counties
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