The highway parallels the Snake River from an intersection with SR 128 north of Clarkston to the Port of Wilma.

SR 128 turns east towards Lewiston, Idaho and SR 193 travels west on the Wawawai Road parallel to the Snake River and the Great Northwest Railroad to the Port of Wilma,[3] carrying a daily average of 1,600 vehicles in 2011.

[5] The Wawawai area was a community for Chinese laborers working on nearby farms located on the Snake River, founded in 1875.

[6] The community was serviced by the Snake River Valley Railroad that connected Lewiston, Idaho to Washington state.

[2][10] Early plans to extend the highway to US 195 near Pullman in the 1970s were never acted on due to a lack of funds.