Utah State Route 138
|Maintained by UDOT|
|Length||20.444 mi (32.901 km)|
|Existed||1965 – present|
|West end||I-80 near Grantsivlle (exit 84)|
|SR-112 in Grantsville|
|East end||SR-36 at Mills Junction|
State Route 138 is a highway, completely within Tooele County in northern Utah that connects Grantsville to Erda and Stansbury Park. The route runs twenty miles (32 km) and is the old routing of U.S. Route 50 Alternate and U.S. Route 40.
From its western terminus at exit 84 of I-80, northeast of the Stansbury Mountains, the route heads southwest (toward the mountain range), reaching the mining operation of Flux, then turns southeasterly. Upon entering the western side of Grantsville, the highway heads east (serving as Grantsville's Main Street) and turns to the northeast after leaving the city. It runs northeasterly until terminating at Mills Junction north of Stansbury Park, at milepost 62.9 of Highway 36.
When it was first formed in 1933, SR-138 took a similar path to the present-day route, going from Grantsville north to Burmester. This designation was deleted in 1953.
The current route of SR-138 was formed in 1965, when SR-2 was moved to the north to reflect the future alignment of then under-construction I-80. The state legislature wanted to keep the old alignment of looping down to Grantsville in the state highway system, so it was re-designated as SR-138. This designation has remained the same since that action.
|I-80 – Wendover, Salt Lake City||Western terminus; Exit 84 on I-80|
|Grantsville||12.209||19.648||SR-112 south (800 East)|
|Mills Junction||20.444||32.901||SR-36||Eastern terminus|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi