SR-42 (UT)
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| Route information | ||||
| Defined by Utah Code §72-4-110 | ||||
| Maintained by UDOT | ||||
| Length: | 7.390 mi (11.893 km) | |||
| Existed: | 1912 as a state highway; 1927 as SR-42 – present | |||
| Major junctions | ||||
| West end: | Idaho state line near Malta, ID | |||
| East end: |
 SR-30 Curlew Junction
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State Route 42 (SR-42) is a 7.390-mile-long (11.893 km) state highway completely within Box Elder County in the U.S. state of Utah. It connects SR-30 to former SH-81 at the Idaho state line. The highway was formerly part of U.S. Route 30S (US-30S), prior to being bypassed and replaced with what is now signed as Interstate 84 (I-84).
From its western terminus at the Idaho state line, the UT-42 travels southeast until Cedar Creek, where it turns east-southeast. It continues in this manner until its eastern terminus at SR-30, known as Curlew Junction.
The road from SR-17 (now SR-82) in Tremonton northwest to Snowville became a state highway in 1912 as part of the Midland Trail (which continued to Nevada via present SR-30. The state highway was extended to Idaho in 1921, became part of US 30S in 1926, and received the (unsigned) SR-42 designation in 1927. The route was extended slightly east from Tremonton to SR-41 (now SR-13) in 1945, taking over what had been part of SR-82. When SR-3 was assigned to proposed I-80N in 1962, SR-42 east of the Snowville junction (exit 7) became SR-3. (Later, the portion near Tremonton would be renumbered SR-102.) Finally, in 1969, SR-42 received its present termini, as SR-70 (now SR-30) was extended east over SR-42 to I-84 west of Snowville, and the roadway through Snowville was removed from the state highway system. The American Association of State Highway Officials approved the relocation of US-30S onto I-84 in 1970, after which the first SR-42 signs were placed on the route that had been so designated since 1927.
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