SR 193, if constructed as originally intended, would have completed an all-Washington State link between Pullman and Clarkston. The SR 193 corridor, beginning at Jct US 12 in Clarkston and ending at Jct US 195 at Colton, was added to the state highway system in 1969. The RCW description stated that the state would not maintain existing county roads in the corridor until such time as the permanent highway was built and adopted by the Highway (now Transportation) Commission. Lower Granite Dam was constructed in the mid 1970s. Before the waters of Lower Granite Lake backed up behind the dam, piers were built for the Red Wolf Crossing (bridge) on the NW side of Clarkston. The spans between the piers were not built until a few years later. As part of the work done to mitigate effects of the creation of Lower Granite Lake, the Army Corps of Engineers relocated the county road and parallel railroad tracks to a higher elevation on the north side of the Snake River. Similar relocation work was done to US 12 on the opposite bank. The Red Wolf Crossing and a few miles of the relocated county road were eventually signed as SR 193.
In 1990, SR 193 from US 12 to the intersection at the north end of the Red Wolf Crossing was transferred to SR 128. SR 128 was continued east from Jct SR 193 at the north end of the Red Wolf Crossing to the Idaho State Line to meet Idaho SR 128. Effective April 1, 1992, the portion of SR 193 from the west side of the Port of Wilma to Colton was dropped from the state highway system. Today SR 193 is 2.58 miles long.
The unposted legislative number for SR 193 in 1969 and 1970 was SSH 3G.
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