Utah State Route 186
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| Route information | ||||
| Defined by Utah Code §72-4-124 | ||||
| Maintained by UDOT | ||||
| Length: | 9.336 mi (15.025 km) | |||
| Existed: | 1935 – present | |||
| Major junctions | ||||
| West end: |
 US-89 in Salt Lake City
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US-89 in Salt Lake City SR-71 in Salt Lake City |
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| East end: |
  I-80 / I-215 in Salt Lake City |
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| Highway system | ||||
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State Route 186 (SR-186) is a state highway entirely within Salt Lake City, capital of the U.S. state of Utah. It forms a quarter-beltway connecting US-89 and I-15 leading north from Salt Lake City to I-80 leading east; as such, it effectively forms the missing (non-freeway) quarter of the I-215 belt route around the city, though it does not directly connect to I-215 at the north end. Despite this beltway role, the route passes through downtown Salt Lake City because downtown is built right up to the northern mountains surrounding City Creek Canyon. The portion of the route connecting downtown to I-80 is a high-capacity street heavily used by commuters, especially those travelling to the University of Utah or between downtown and eastern neighborhoods, but the portion on Capitol Hill north of downtown is much narrower and has sharp turns around the Capitol grounds. The roadway runs 9.34 miles (15.03 km) along Victory Road, Columbus Street, 300 North, State Street, 400 South, 500 South, and Foothill Drive.
The highway, as SR-186, was formed in 1935, initially going from what is now US-89 in downtown east on 400 South, west on 200 South after a gap, and south on 1300 East to US-40, now 2100 South. Portions of this route were signed as US-40 Alternate. By 1954, Foothill Drive existed in its current state and US-40A, as well as the legislative and unsigned SR-186 designation, was routed along that road. At one point, the highway extended west to the Salt Lake City International Airport (well after US-40A was truncated), but this connection was lost in 2007 when SR-186 was aligned to cover all of former SR-184, which was decommissioned that same year.
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