California State Route 174
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| Route information | ||||
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| Maintained by Caltrans | ||||
| Length: | 13.096 mi (21.076 km) | |||
| History: | State highway in 1933; SR 174 in 1964 | |||
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| South end: |
 I-80 in Colfax
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| North end: |
  SR 20 / SR 49 in Grass Valley
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State Route 174 (SR 174) is a state highway in the U.S. state of California. The two-lane 13-mile (21 km) highway, added to the state highway system in 1933, connects Interstate 80 in Colfax with SR 20/SR 49 in Grass Valley, crossing the Bear River next to a 1924 concrete arch bridge. The majority of the highway is eligible for the State Scenic Highway System, but local residents have blocked its designation due to property rights concerns.
State Route 174 begins at exit 135 of I-80 in Colfax. Immediately after crossing I-80, the route turns right on Auburn Street and right again on Central Street, which bypasses downtown; a business route follows Auburn Street, Grass Valley Street, and Main Street through downtown. SR 174 follows the old Lincoln Highway (US 40) north out of downtown to Rollins Lake Road, where the present state highway turns northwest along the Colfax Highway. It then crosses the Bear River from Placer County into Nevada County on a 1987 bridge, with the old 1924 bridge preserved for non-motorized traffic. The land flattens out as SR 174 curves north and west through the Empire Mine State Historic Park into Grass Valley. Turning west on Colfax Avenue, the state highway passes under the SR 20/SR 49 freeway before ending just beyond at Auburn Street, the former surface routing of SR 49.
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