Utah State Route 51
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| Route information | ||||
| Defined by Utah Code §72-4-111 | ||||
| Maintained by UDOT | ||||
| Length: | 3.339 mi (5.374 km) | |||
| Existed: | 1992 – present | |||
| Major junctions | ||||
| South end: |
 SR-147 in Spanish Fork
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| North end: |
 US-89 in Springville
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| Highway system | ||||
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State Route 51 is a short highway completely within Utah County in northern Utah that connects SR-147 to US-89. The highway runs for three miles (5 km) and is an old routing of U.S. Route 91.
The route begins at the intersection of 400 North (SR-147) and Childs Road in Spanish Fork, SR-51 heading northeast as a two-lane undivided highway on the latter. As the road exits Spanish Fork, it heads into a rural portion of Utah County. The continues northeast until 1600 North south of Springville, where the road turns north. The road continues north until terminating at a grade-separated intersection with US-89, one of the oldest grade-separated intersections in Utah.
The road from Spanish Fork to Springville (leaving the latter on 800 North) was added to the state highway system in 1910, and in the 1920s it became part of SR-1 (US-91). In 1964, when SR-1 was moved to the newly completed I-15 in the area, the old route between Spanish Fork and Springville became an extension of SR-156 (which had been created in 1962 as a short connection between old and new SR-1 at exit 257). In 1992, because of safety problems at "Maggie's Bend", where SR-156 turned from 800 North onto Childs Road in eastern Spanish Fork, caused in part by superelevation of the curve, 800 North was given to the city and the state took over Childs Road. This split SR-156 in two (with the original section, serving as a spur since 1964, becoming part of the mainline), and the portion on Childs Road and to Springville became a new State Route 51.
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