Interstate 280 (California)
|Defined by S&HC § 580|
|Maintained by Caltrans|
|Length:||57.510 mi (92.553 km)|
|Existed:||September 15, 1955 by FHWA
July 1, 1964 by Caltrans – present
|South end:||I-680 / US 101 in San Jose|
|I-880 in San Jose
SR 85 in Cupertino
SR 92 near San Mateo
SR 1 in Daly City
|North end:||King Street, 5th Street in San Francisco|
Interstate 280 (I-280) is a 57-mile (92-km) long north–south Interstate Highway in the San Francisco Bay Area of Northern California. It connects San Jose and San Francisco, running along just to the west of the cities of San Francisco Peninsula for most of its route.
I-280 from its southern terminus at U.S. 101 and Interstate 680 north to Interstate 880 in San Jose is part of the Sinclair Freeway. From I-880 to State Route 1 in Daly City was built and dedicated as the Junipero Serra Freeway. One of the dedication signs (in Daly City) still indicates that the Junipero Serra Freeway is known as the World's Most Beautiful Freeway due to its scenic route through the San Francisco Peninsula. From State Route 1 to the James Lick Freeway in San Francisco is officially called the John F Foran Freeway, but is more commonly referred to by its original name, the Southern Freeway. And from the James Lick Freeway to its northern end at King Street and Fifth Street, I-280 is called the Southern Embarcadero Freeway.
The southern end of Interstate 280 begins at U.S. Route 101 in San Jose, where it acts as a continuation of Interstate 680 westward. In between San Jose and San Francisco, Interstate 280 passes through Santa Clara, Cupertino, Los Altos and Los Altos Hills before it settles along its scenic route just to the west of the cities of the San Francisco Peninsula in San Mateo County and just to the east of the Santa Cruz Mountains. I-280 re-emerges in a decidedly urbanized area in the city of San Bruno, passing through South San Francisco and Daly City before it runs across a southeastern swath of the city of San Francisco on the way to its northern terminus.
The segment of the Junipero Serra Freeway between Cupertino and Daly City has been called the "World's Most Beautiful Freeway" since its dedication in the 1960s. Drivers along this portion of Interstate 280 are treated to scenic views of the Santa Cruz Mountains to the west and, at a few points, San Francisco Bay to the east, and are isolated by hills from the cities to the east. Through much of this segment, the freeway is actually running just inside the eastern rim of the rift valley of the San Andreas Fault. A particularly attractive 6-mile (10 km) stretch of the freeway from Hillsborough to Belmont provides a beautiful look at Crystal Springs Reservoir, formed by water piped over 160 miles (260 km) from Hetch Hetchy Valley in Yosemite National Park, partly filling the rift valley.
For nearly all of its length, Interstate 280 runs roughly parallel and several miles to the west of U.S. Route 101 (the Bayshore Freeway). Both freeways are north–south routes connecting San Jose with San Francisco; however, unlike I-280, the route that U.S. Route 101 takes between the two cities goes entirely through urbanized areas. The majority of the population of the San Francisco Peninsula lives somewhere between Interstate 280 and U.S. Route 101.
I-280 never intersects with Interstate 80, its parent interstate. The northern terminus of I-280 is within about a mile of I-80's western terminus (at the approach to the San Francisco – Oakland Bay Bridge), but the two interstates do not directly connect. Although San Francisco has had several opportunities to connect I-280 to I-80, it has chosen to use the money for other purposes. Connecting the two freeways is considered to be politically and financially infeasible at this time, due to the city's strong anti-freeway stance. Instead, 280's northernmost extension primarily functions as a spur into Downtown San Francisco, as suggested by signage on northbound U.S. Route 101 at its San Francisco interchange with 280 (see history section below).
Most of Interstate 280, from San Jose to Daly City, is designated as the Junipero Serra Freeway in honor of Spanish missionary Junípero Serra, who founded many of California's missions in the 18th century. A 26-foot (8 m) high faux-sandstone statue of Father Serra kneeling and pointing over the freeway is located at a highway rest area just north of the Highway 92 intersection between the Bunker Hill Drive and Black Mountain Road exits on northbound I-280 in Hillsborough, and can be clearly seen by drivers in both directions. The segment of Interstate 280 north of SR 1 in San Francisco was originally named the Southern Freeway, but has since recently been officially renamed the John F. Foran Freeway after John Foran, a former California State Senator and Assembly member and current partner at law firm Nossaman LLP; however, most people still refer to this section of the freeway by its original name, the Southern Freeway. The section of I-280 between the James Lick Freeway and its end at 6th St. and King Street is called the Southern Embarcadero Freeway.
The Junipero Serra Freeway is Route 280 from SR 1 in San Francisco to SR 17, as named by Assembly Concurrent Resolution 140, Chapter 208 in 1967.
Interstate 280 was added to the Interstate Highway System on September 15, 1955 as a route from San Jose north to San Francisco. This ran along the present alignment of I-280 south of San Francisco, but in San Francisco it ran north parallel to State Route 1, past the planned west end of Interstate 80 which would have been at the junction with the Panhandle Freeway just south of Fulton and Park Presidio, along what would have been the Park Presidio Freeway north to the south approach to the Golden Gate Bridge. At that point, I-280 would have met Interstate 480, which would have headed east on Doyle Drive (U.S. Route 101), the Golden Gate Freeway, and onto the Embarcadero Freeway to reach the San Francisco – Oakland Bay Bridge. I-480 would have continued south on the never-built section of the Southern Embarcadero Freeway from Folsom and the Embarcadero to 5th and King Street, then along the present Southern Embarcadero Freeway to meet the Southern Freeway (now I-280) near the Alemany Maze, which served as the 101A Bypass until I-280 was built. The I-280 number was approved on November 10, 1958.
In the 1964 renumbering, the Route 280 designation was officially applied to the planned route. This replaced SR 1 in San Francisco; the new SR 1 alignment turned northeast where I-280 now runs, quickly ending at State Route 82 (San Jose Avenue/Alemany Boulevard). SR 1 however continued to be signed along its former (and current) alignment, which had not been upgraded to freeway standards.
A realignment approved January 1968 took I-280 onto its current route. This ran along what had been SR 1, SR 82, State Route 87 and I-480 (downgraded to a State Route then), ending at Interstate 80 at the west end of the Bay Bridge. This change was made on the state level in 1968, restoring SR 1 to its current alignment and truncating SR 82, SR 87 and SR 480.
The section of I-280 between SR 92 (San Mateo) and SR 84 (Woodside) was not completed until the 1970s. Until then, traffic was routed on Cañada road between the two ends.
The short piece of I-280 between 3rd Street and SR 480 in downtown San Francisco was never built, and the piece from 5th Street south to U.S. Route 101 was reconstructed after it was damaged by the 1989 Loma Prieta earthquake. The piece between SR 480 and I-80 was torn down along with the rest of the Embarcadero Freeway; ramp stubs which would have connected the freeways were removed as part of the San Francisco – Oakland Bay Bridge Western Approach reconstruction project.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. R reflects a realignment in the route since then. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
|San Jose||R0.00||I-680 north – Sacramento||Continuation beyond US 101|
|R0.00||US 101 (Bayshore Freeway) – San Francisco, Los Angeles||Southbound exit and northbound entrance|
|R0.37||1A||McLaughlin Avenue||Southbound exit and northbound entrance|
|R1.29||1B||11th Street, 10th Street||Signed as exit 1 northbound|
|R1.99||2A||To SR 82 / 7th Street, Virginia Street||Signed as exit 2 northbound|
|2B||Almaden Boulevard, Vine Street||Southbound exit and northbound entrance|
|R2.52||3A||SR 87 (Guadalupe Parkway)|
|R3.76||4||Race Street, Southwest Expressway||Northbound exit and southbound entrance|
|R3.99||4||Meridian Avenue||Southbound exit and northbound entrance|
|L4.66||5A||Leigh Avenue, Bascom Avenue|
|L5.41||5B||I-880 north / SR 17 south – Oakland, Santa Cruz||Signed as exits 5B (south) and 5C (north) northbound|
|4.57||6||Winchester Boulevard – Campbell||Southbound exit and northbound entrance|
|5.95||7||Saratoga Avenue – Saratoga|
|9||Lawrence Expressway (CR G2), Stevens Creek Boulevard|
|9.43||11||De Anza Boulevard|
|10.74||12||SR 85 – Mountain View, Gilroy||Signed as exits 12A (north) and 12B (south)|
|Los Altos||11.45||13||Foothill Expressway, Grant Road|
|Los Altos Hills||15.05||16||El Monte Road, Moody Road|
|18.38||20||Page Mill Road, Arastradero Road – Palo Alto|
|20.61||22||Alpine Road – Portola Valley|
|R1.61||24||Sand Hill Road – Menlo Park|
|Woodside||R3.34||25||SR 84 (Woodside Road) – Woodside|
|R4.65||27||Farm Hill Boulevard|
|R6.60||Canada Road||No exit ramps|
|10.87||33||SR 92 – San Mateo, Hayward, Half Moon Bay||Southbound exit to SR 92 west is via exit 34|
|R12.32||34||SR 35 south / Bunker Hill Drive||South end of SR 35 overlap|
|Hillsborough||R14.22||36||Black Mountain Road, Hayne Road|
|R17.16||39||Trousdale Drive – Burlingame|
|Millbrae||R17.92||40||Millbrae Avenue||Northbound exit and southbound entrance|
|R18.52||41||Larkspur Drive, Millbrae Avenue||Southbound exit and northbound entrance|
|San Bruno||R19.28||41||SR 35 north (Skyline Boulevard) – Pacifica||North end of SR 35 overlap; northbound exit and southbound entrance|
|R20.22||42||Crystal Springs Road||Southbound exit and northbound entrance; former SR 117|
|R20.75||43A||San Bruno Avenue||Signed as exit 43B southbound|
|R21.02||43B||I-380 east to US 101 – San Francisco International Airport||Signed as exit 43A southbound|
|R21.31||43A||Sneath Lane||Signed as exit 43B southbound|
|South San Francisco||R22.04||44||Avalon Drive||Northbound exit and southbound entrance; former SR 117|
|R22.62||45||Westborough Boulevard||Northbound exit is via exit 44|
|Daly City||R24.20||46||Hickey Boulevard – Colma, South San Francisco|
|R24.63||47A||Serramonte Boulevard||Southbound exit and northbound entrance|
|R25.28||47B||SR 1 south – Pacifica||South end of SR 1 overlap; signed as exit 47 northbound|
|R25.78||48||Eastmoor Avenue, Mission Street||Signed as exit 47 northbound|
|M27.17||49A||Daly City, Westlake District (Junipero Serra Boulevard)||Signed as exit 49 southbound|
|M27.17||49B||SR 1 north (19th Avenue) – Golden Gate Bridge||North end of SR 1 overlap; northbound left exit and southbound entrance|
|R0.74||50||SR 82 to SR 1 north / Mission Street – Daly City||Southbound exit and northbound entrance|
|R1.77||51||Geneva Avenue, Ocean Avenue|
|R2.70||52||Monterey Boulevard||Southbound exit and northbound entrance|
|R2.70||52||San Jose Avenue||Northbound exit and southbound entrance|
|R3.28||53||Alemany Boulevard, Mission Street|
|R4.34||54A||US 101 south (James Lick Freeway) – San Jose||Signed as exit 54 southbound|
|R4.34||54B||US 101 north (James Lick Freeway) – San Francisco Civic Center, Bay Bridge||Northbound exit and southbound entrance|
|R5.62||55||Cesar Chavez Street, 25th Street|
|R6.60||56||Mariposa Street, 18th Street|
|T7.54||57||Sixth Street||Northbound exit and southbound entrance|
|T7.26||King Street||Northbound exit and southbound entrance|
- "California Highways: Interstate Highway Types and the History of California's Interstates". Cahighways.org. Retrieved 2013-01-26.
- "California Highways: Interstate 280". Cahighways.org. Retrieved 2013-01-26.
- California Department of Transportation, State Truck Route List[dead link] (XLS file), accessed February 2008
- "2008 Named Freeways, Highways, Structures and Other Appurtenances in California". Retrieved 2013-01-26.
- "In the Eye of the Beholder | A Kauai Blog". Great-hikes.com. 2005-03-23. Retrieved 2013-01-26.
- "CA Codes (shc:250-257)". Leginfo.ca.gov. Retrieved 2013-01-26.
- "CA Codes (shc:260-284)". Leginfo.ca.gov. Retrieved 2013-01-26.
- National Geographic (October 2006). The United States (Map).
- 2006 Named Freeways, Highways, Structures and Other Appurtenances in California (PDF). Caltrans. p. 60. Retrieved 2007-03-28.[dead link]
- California Department of Transportation, Log of Bridges on State Highways, July 2007
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- California Department of Transportation, California Numbered Exit Uniform System, I-280 Northbound and I-280 Southbound, accessed February 2008
|Wikimedia Commons has media related to: Interstate 280 (California)|
- AARoads - Interstate 280
- Planning maps for the pre-1968 planned route of the freeway along Junipero Serra Boulevard in San Francisco