State Route 20 (SR-20) is a state highway in southern Utah, running 20.492 miles (32.979 km) in Iron and Garfield Counties, without directly serving or connecting any cities. It serves as a truck connection between I-15 and US-89 and an access to Bryce Canyon National Park. It may also be used to travel between Salt Lake City and Phoenix, Arizona. The highway follows the route of the Old Spanish Trail.^[2]

Quick Facts State Route 20, Route information ...

State Route 20
SR-20 highlighted in red
Route information
Maintained by UDOT
Length	20.492 mi[1] (32.979 km)
Existed	1917 as a state highway; 1927 as SR-20–present
Major junctions
West end	I-15 near Paragonah
East end	US 89 near Panguitch
Location
Country	United States
State	Utah
Highway system
Utah State Highway System Interstate US State Minor Scenic
← SR-19 → SR-21

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SR-20 begins at I-15, Exit 95, 14 miles (23 km) north of Paragonah, and heads east and southeast through a pass between the Markagunt Plateau and the Tushar Mountains. It ends at an intersection with US-89 at Bear Valley Junction. Trucks are routed from I-15 and US-89 onto SR-20 in preference to SR-9 and SR-14 to avoid steep grades and switchbacks required to cross the Markagunt Plateau. Because of this, SR-20 is included in the National Highway System.^[3] SR-20 itself is a difficult route, featuring 7% grades on the approaches to the 7,910-foot (2,410 m) summit, and oversize vehicles are required to have a pilot escort.^[1][4]

The route of SR-20 was first used by non-Native Americans in 1864, by the settlers of Panguitch.^[5] It crosses the Tushar Mountains just south of the Old Spanish Trail's crossing.

The road from SR-1 (by 1926 US-91, now SR-271) in Paragonah to SR-11 (by 1926 US-89) at Bear Valley Junction was added to the state highway system in 1917.^[6] In 1927, the legislature assigned the State Route 20 designation to it,^[7] and in 1953 the west end was moved north to the present junction with I-15,^[6] removing Little Creek Canyon Road and Upper Bear Valley Road from the state highway system.