Interstate 80 in California

Interstate 80 in California

Infobox road
alternate_name=Bayshore Freeway, Eastshore Freeway

established=August 7, 1947 by FHWA [ California Highways: Interstate Highway Types and the History of California's Interstates] ] July 1, 1964 by Caltrans [ California Highways: Interstate 80] ]
terminus_a=jct|state=CA|US|101 in San Francisco
junction=jct|state=CA|I|580|I|880 in Oakland jct|state=CA|I|505 in Vacaville jct|state=CA|I|5 in Sacramento jct|state=CA|SR|49 in Auburn jct|state=CA|SR|89 in Truckee
terminus_b=jct|state=NV|I|80 at Nevada state line
In the U.S. state of California, Interstate 80, a major east-west route of the Interstate Highway System, has its western terminus in San Francisco, California, United States. From San Francisco it heads east across the Bay Bridge to Oakland, where it turns north and crosses the Carquinez Bridge before turning back northeast and east through Sacramento Valley. I-80 then goes over Sierra Nevada mountain range and crosses into Nevada state.

Route description

West end in San Francisco

According to signage, I-80 begins at its intersection with U.S. Route 101 in San Francisco. However, the San Francisco Skyway is not part of the Interstate Highway System; the Interstate actually begins at the west end of the Bay Bridge, at the ramps formerly connecting to the Embarcadero Freeway. Thus the first 1.20 miles (1.93 km) of the signed Interstate are not an actual Interstate. [Federal Highway Administration, [ National Highway System: San Francisco--Oakland CA] , April 2004] [California Department of Transportation, [ California Road System (CRS) Maps] , accessed November 2007]

When I-80 was first approved, it was to head north on the Central Freeway (US 101) and west on the never-built Panhandle Freeway, ending at planned I-280 (State Route 1) in Golden Gate Park. A January 1968 amendment moved I-280 to its present alignment, removed Interstate 480, and truncated I-80 to the Embarcadero Freeway (then I-280, formerly I-480). These changes were made on the state level later that year, but Route 80 was only truncated to US 101. (The Central Freeway remained part of US 101, and the Panhandle Freeway became "State Route 241". The Panhandle Freeway was later cancelled in the wake of the Freeway Revolts, and the State Route 241 designation has since been reassigned to an unrelated stretch of highway in Orange County) The San Francisco Skyway, which had already been signed as part of I-80, has remained a de facto section of Interstate 80 to the present day and remains listed as part of Route 80 in California.

The Eastshore Freeway is a segment of Interstate Highways 80 and 580 which runs along the northeast shoreline of San Francisco Bay in northern California. It begins at the Carquinez Bridge and ends at the MacArthur Maze interchange just east of the western end of the San Francisco – Oakland Bay Bridge. Interstate 580 joins the Eastshore Freeway at an interchange in Albany.

acramento portion

Legislative Route 242 was defined in 1957, connecting pre-1964 Legislative Route 6 west of Sacramento to pre-1964 Legislative Route 3 northeast of Sacramento. [ [ California Highways: Legislative Route 242] ] Interstate 880, a bypass of I-80, was approved along Legislative Route 242 by the American Association of State Highway Officials on November 10, 1958. [ [ California Highways: Interstate Highway Types and the History of California's Interstates] ] The Route 880 designation was adopted by the state in the 1964 renumbering; the bypass was completed in 1972.

Interstate 80 has run north of Sacramento on the Beltline Freeway which was originally Interstate 880, a bypass freeway. The I-80 routing alignment was moved from a route through Sacramento, now Interstate 80 Business, after the proposed Interstate 80 replacement of the North Sacramento Freeway was cancelled. The Beltline Freeway runs northeast from the junction of I-80 and I-80 Business (U.S. Route 50 there) in West Sacramento across Interstate 5 to its junction northeast of Sacramento with I-80 Business (which is State Route 51). State Route 244 heads east as a short freeway spur) from that interchange.

ierra Nevada portion

Crossing the Sierra Nevada, I-80 regularly gets snow at higher elevations from fall to spring. Caltrans sometimes requires vehicles to use snow tires, snow chains or other traction devices in the mountains during and after snowstorms.cite web |url= |title=Chain Controls |date=2007 |accessdate=2008-01-04 |author=Caltrans] Checkpoints are often utilized to enforce chain restrictions prior to entering icy or snowy portions of the interstate.

I-80 crosses the Sierra Nevada crest at the Donner Summit also known as Euer Saddle at the elevation convert|7239|ft|m westbound and convert|7227|ft|m eastbound. [ [ Elevation and Location of Summits and Passes in California] ] The summit is located in Nevada County (California state). The pass is generally open year-round; it is plowed in winter, but may temporarily close during the worst snowstorms. The older route over Donner Pass is about two miles (3 km) south. Albeit Donner Pass is lower, Euer Saddle was chosen for the interstate because of more gradual approaches. Portions of I-80 through the Sierra-Nevada mountain range are really rough, and the road is badly cracked.fact|date=October 2008|(02 October)

Other names

Interstate 80 has the following names, as designated by various state laws: [cite book | url= | title=2006 Named Freeways, Highways, Structures and Other Appurtenances in California | publisher=Caltrans | pages=116 | accessdate=2007-10-13]

*Alan S. Hart Freeway: from the Sacramento/Placer County line to the Nevada state line.
*Dutch Flat and Donner Lake Wagon Road: from Emigrant Gap to Donner Lake.
*Lincoln Highway: from Sacramento to Reno.
*Kent D. Pursel Memorial Freeway: from the Bay Bridge to the Alameda/Contra Costa County line.
*Linus F. Claeys Freeway: from SR 4 to the Carquinez Bridge.
*Dwight D. Eisenhower Highway: for its entire length.
*East-West Blue Star Memorial Highway: for its entire length.

Exit list

:"Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at some county lines; the start and end postmiles in each county are given in the county column."


External links

* [ Caltrans District 4: Current major projects on Route 80]

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