California State Route 52
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| Soledad Freeway San Clemente Canyon Freeway |
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State Route 52 highlighted in red
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length: | 17.222 mi (27.716 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: |
 I-5 in San Diego
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| East end: |
 SR 67 in Santee |
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| Location | ||||
| Counties: | San Diego | |||
| Highway system | ||||
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State Route 52 (SR 52) is a state highway in San Diego County, California, that extends from La Jolla Parkway at Interstate 5 (I-5) in La Jolla, San Diego, to SR 67 in Santee. It is a freeway for its entire length and serves as a major east–west route through the northern part of the city of San Diego. The road connects the major north–south freeways of the county, including I-5, I-805, SR 163, I-15, SR 125, and SR 67. SR 52 passes north of the Rose Canyon Fault before traversing Marine Corps Air Station Miramar (MCAS Miramar). East of Santo Road and west of SR 125, the highway goes through Mission Trails Regional Park, a large open preserve. SR 52 is also known as the Soledad Freeway and the San Clemente Canyon Freeway.
Plans for a route between La Jolla and Santee date from 1959, and SR 52 was officially designated in the 1964 state highway renumbering. Construction began in 1966 at the I-5 interchange with Ardath Road leading to La Jolla. It continued with the building of San Clemente Canyon Road, which was later widened to become SR 52. The freeway was completed east to I-805 in 1970, and was built in two stages from there to Santo Road east of I-15; the last phase was completed in 1988.
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