The highway extends eastward from the Port of Almota on the Snake River to an intersection with U.S. Route 195 (US 195) west of Pullman.

[5] The Almota area was a port on the Snake River with a ferry and was home to Chinese laborers working on nearby farmland.

[6] The ferry Annie Faxon exploded traveling downstream from Almota to Riparia on August 14, 1893, killing eight people because of a faulty boiler.

[8][9] The Port of Whitman County was established in 1958 and began developing facilities in Almota after the completion of the Lower Granite Dam in 1965.

[10] Shortly after the establishment of the Port of Almota, the roadway was reconstructed, beginning with an improved Wawawai-Pullman Road by 1963.