Interstate 380 (California)
Encyclopedia
Interstate 380 is a short 3.3-mile (5.3 km) east–west spur
Interstate Highway
in the San Francisco Bay Area
of Northern California
, connecting Interstate 280
in San Bruno
to U.S. Route 101 near the San Francisco International Airport
(SFO). The highway primarily consists of only three intersections: I-280, El Camino Real
(State Route 82
), and U.S. 101. Like nearby I-280, I-380 never connects to Interstate 80
, its parent Interstate Highway. However, there is no rule that says that spur routes need to. (Similarly, the spur route Interstate 795
branches off from Interstate 695
, a beltway around Baltimore
, and is only indirectly linked to Interstate 95.)
I-380 is officially known as the Quentin L. Kopp Freeway, named after the prominent Calif. State Senator
from San Mateo County. This highway was previously named the Portola Freeway to honor the eighteenth century Spanish explorer Gaspar de Portolà
, whose expedition in 1769-70 discovered the San Francisco Bay
, from a viewpoint
on the Sweeney Ridge
located between San Bruno and Pacifica
.
Interstate 380 is part of the California Freeway and Expressway System
.
(see below). I-380 then travels east through the City of San Bruno, intersecting with State Route 82
, El Camino Real
, before reaching US 101.
At its terminus at US 101, the mainline lanes of I-380 continue as North Access Road. Meanwhile, the ramps to and from southbound US 101 provide connections to collector/distributor roads leading directly to San Francisco International Airport
, allowing traffic between the Interstate and the airport to avoid merging with the main traffic lanes of US Highway 101.
(the Cabrillo Highway), but due to the route's passing over the San Andreas Fault
and opposition from members of the local community, this project has yet to be tackled. The westbound lanes of I-380 branch off to the right at I-280, leaving a very wide, paved space which would carry the freeway extension under I-280 towards SR 1. This space is currently often used as storage space for equipment used in highway maintenance. A pair of unused bridges crossing over the I-280 South to I-380 East offramp remain as evidence.
Despite the opposition, Chapter 2, Article 3, Section 608 of the California Streets and Highways Code still legally defines Route 380 as traveling from "Route 1 near Pacifica to Route 280 in San Bruno", and the exit numbers assigned at I-280 go to five instead of one or zero.
Although recent California Highway Log still propose alternative plans to extend the highway in a more peculiar configuration, slightly southwest of the I-280/I-380 interchange. This might make the extension project slightly longer, perhaps bending I-380 a bent V-shape. This concept is still very controversial, and it is unlikely to be undertaken.
The entire route is in San Mateo County
.
{| class=wikitable
!Location
!Postmile
!Exit
!Destinations
!Notes
|-
|rowspan=3|San Bruno
|bgcolor=#ffdddd|T4.70
|bgcolor=#ffdddd|5
|bgcolor=#ffdddd|
|bgcolor=#ffdddd|Westbound exit and eastbound entrance; signed as exits 5A (north) and 5B (south)
|-
|5.47
|5C
|
|Signed as exit 5 eastbound
|-
|6.37
|6
|
|Signed as exits 6A (south) and 6B (north) eastbound
|-
|rowspan=2|South San Francisco
|bgcolor=#ffdddd|6.76
|bgcolor=#ffdddd|7
|bgcolor=#ffdddd|South Airport Boulevard
|bgcolor=#ffdddd|Eastbound exit and westbound entrance
|-
|bgcolor=#ffdddd|6.76
|bgcolor=#ffdddd|
|bgcolor=#ffdddd|North Access Road
|bgcolor=#ffdddd|Eastbound exit and westbound entrance
Spur route
A spur route is a short road forming a branch from a longer, more important route . A bypass or beltway is never considered a true spur route as it typically reconnects with the major road...
Interstate Highway
Interstate Highway System
The Dwight D. Eisenhower National System of Interstate and Defense Highways, , is a network of limited-access roads including freeways, highways, and expressways forming part of the National Highway System of the United States of America...
in the San Francisco Bay Area
San Francisco Bay Area
The San Francisco Bay Area, commonly known as the Bay Area, is a populated region that surrounds the San Francisco and San Pablo estuaries in Northern California. The region encompasses metropolitan areas of San Francisco, Oakland, and San Jose, along with smaller urban and rural areas...
of Northern California
Northern California
Northern California is the northern portion of the U.S. state of California. The San Francisco Bay Area , and Sacramento as well as its metropolitan area are the main population centers...
, connecting Interstate 280
Interstate 280 (California)
Interstate 280 is a 57-mile 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 northern end at King...
in San Bruno
San Bruno, California
San Bruno is a city in San Mateo County, California, United States. The population was 41,114 at the 2010 census.The city is adjacent to San Francisco International Airport and Golden Gate National Cemetery.-Geography:San Bruno is located at...
to U.S. Route 101 near the San Francisco International Airport
San Francisco International Airport
San Francisco International Airport is a major international airport located south of downtown San Francisco, California, United States, near the cities of Millbrae and San Bruno in unincorporated San Mateo County. It is often referred to as SFO...
(SFO). The highway primarily consists of only three intersections: I-280, El Camino Real
El Camino Real (California)
El Camino Real and sometimes associated with Calle Real usually refers to the 600-mile California Mission Trail, connecting the former Alta California's 21 missions , 4 presidios, and several pueblos, stretching from Mission San Diego de Alcalá in San Diego...
(State Route 82
California State Route 82
State Route 82 is a state highway in the U.S. state of California that runs from U.S. Route 101 at Blossom Hill Road in San Jose to Interstate 280 in San Francisco following the San Francisco Peninsula...
), and U.S. 101. Like nearby I-280, I-380 never connects to Interstate 80
Interstate 80 in California
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 there it heads east across the Bay Bridge to Oakland, where it turns north and crosses the Carquinez Bridge...
, its parent Interstate Highway. However, there is no rule that says that spur routes need to. (Similarly, the spur route Interstate 795
Interstate 795 (Maryland)
Interstate 795 , also known as the Northwest Expressway, is a nine-mile freeway linking Baltimore's northwestern suburbs of Pikesville, Owings Mills and Reisterstown, Maryland to the Baltimore Beltway...
branches off from Interstate 695
Interstate 695 (Maryland)
Interstate 695 is a -long full beltway Interstate Highway extending around Baltimore, Maryland, USA. I-695 is officially designated the McKeldin Beltway, but is colloquially referred to as either the Baltimore Beltway or 695...
, a beltway around Baltimore
Baltimore
Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...
, and is only indirectly linked to Interstate 95.)
I-380 is officially known as the Quentin L. Kopp Freeway, named after the prominent Calif. State Senator
Quentin L. Kopp
Quentin Lewis Kopp is an American politician and retired judge. He served as a member of the San Francisco Board of Supervisors and in the California State Senate. Kopp ran unsuccessfully for Mayor of San Francisco in 1979 against Dianne Feinstein...
from San Mateo County. This highway was previously named the Portola Freeway to honor the eighteenth century Spanish explorer Gaspar de Portolà
Gaspar de Portolà
Gaspar de Portolà i Rovira was a soldier, governor of Baja and Alta California , explorer and founder of San Diego and Monterey. He was born in Os de Balaguer, province of Lleida, in Catalonia, Spain, of Catalan nobility. Don Gaspar served as a soldier in the Spanish army in Italy and Portugal...
, whose expedition in 1769-70 discovered the San Francisco Bay
San Francisco Bay
San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...
, from a viewpoint
San Francisco Bay Discovery Site
The San Francisco Bay Discovery Site is where the first recorded European discovery of San Francisco Bay took place on November 4, 1769. Spanish explorer Gaspar de Portolà, unable to find the port of Monterey, California, continued north close to what is now Pacifica...
on the Sweeney Ridge
Sweeney Ridge
Sweeney Ridge, a national park in Pacifica, California, is part of the Golden Gate National Recreation Area. Historically, the ridge was the location of the San Francisco Bay Discovery Site, as part of the Portolá Expedition on November 4, 1769.-Description:...
located between San Bruno and Pacifica
Pacifica, California
Pacifica is a city in San Mateo County, California, on the coast of the Pacific Ocean between San Francisco and Half Moon Bay.-Overview:The City of Pacifica is spread along a six mile stretch of the north central California coastal beach and hills, nestled in several small valleys spanning between...
.
Interstate 380 is part of the California Freeway and Expressway System
California Freeway and Expressway System
The California Freeway and Expressway System is a system of existing or planned freeways and expressways in the U.S. state of California. It is defined by the Streets and Highways Code.-List of roads in the system:*State Route 1 *State Route 2...
.
Route description
I-380 begins at a junction with I-280 in San Bruno. This junction is really only partially built, allowing room to build a proposed freeway extension west towards State Route 1California State Route 1
State Route 1 , more often called Highway 1, is a state highway that runs along much of the Pacific coast of the U.S. state of California. It is famous for running along some of the most beautiful coastlines in the world, leading to its designation as an All-American Road.Highway 1 does not run...
(see below). I-380 then travels east through the City of San Bruno, intersecting with State Route 82
California State Route 82
State Route 82 is a state highway in the U.S. state of California that runs from U.S. Route 101 at Blossom Hill Road in San Jose to Interstate 280 in San Francisco following the San Francisco Peninsula...
, El Camino Real
El Camino Real (California)
El Camino Real and sometimes associated with Calle Real usually refers to the 600-mile California Mission Trail, connecting the former Alta California's 21 missions , 4 presidios, and several pueblos, stretching from Mission San Diego de Alcalá in San Diego...
, before reaching US 101.
At its terminus at US 101, the mainline lanes of I-380 continue as North Access Road. Meanwhile, the ramps to and from southbound US 101 provide connections to collector/distributor roads leading directly to San Francisco International Airport
San Francisco International Airport
San Francisco International Airport is a major international airport located south of downtown San Francisco, California, United States, near the cities of Millbrae and San Bruno in unincorporated San Mateo County. It is often referred to as SFO...
, allowing traffic between the Interstate and the airport to avoid merging with the main traffic lanes of US Highway 101.
History
There were plans to extend I-380 all the way to State Route 1California State Route 1
State Route 1 , more often called Highway 1, is a state highway that runs along much of the Pacific coast of the U.S. state of California. It is famous for running along some of the most beautiful coastlines in the world, leading to its designation as an All-American Road.Highway 1 does not run...
(the Cabrillo Highway), but due to the route's passing over the San Andreas Fault
San Andreas Fault
The San Andreas Fault is a continental strike-slip fault that runs a length of roughly through California in the United States. The fault's motion is right-lateral strike-slip...
and opposition from members of the local community, this project has yet to be tackled. The westbound lanes of I-380 branch off to the right at I-280, leaving a very wide, paved space which would carry the freeway extension under I-280 towards SR 1. This space is currently often used as storage space for equipment used in highway maintenance. A pair of unused bridges crossing over the I-280 South to I-380 East offramp remain as evidence.
Despite the opposition, Chapter 2, Article 3, Section 608 of the California Streets and Highways Code still legally defines Route 380 as traveling from "Route 1 near Pacifica to Route 280 in San Bruno", and the exit numbers assigned at I-280 go to five instead of one or zero.
Although recent California Highway Log still propose alternative plans to extend the highway in a more peculiar configuration, slightly southwest of the I-280/I-380 interchange. This might make the extension project slightly longer, perhaps bending I-380 a bent V-shape. This concept is still very controversial, and it is unlikely to be undertaken.
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 entire route is in San Mateo County
San Mateo County, California
San Mateo County is a county located in the San Francisco Bay Area of the U.S. state of California. It covers most of the San Francisco Peninsula just south of San Francisco, and north of Santa Clara County. San Francisco International Airport is located at the northern end of the county, and...
.
{| class=wikitable
!Location
!Postmile
!Exit
Exit number
An exit number is a number assigned to a road junction, usually an exit from a freeway. It is usually marked on the same sign as the destinations of the exit, as well as a sign in the gore....
!Destinations
!Notes
|-
|rowspan=3|San Bruno
San Bruno, California
San Bruno is a city in San Mateo County, California, United States. The population was 41,114 at the 2010 census.The city is adjacent to San Francisco International Airport and Golden Gate National Cemetery.-Geography:San Bruno is located at...
|bgcolor=#ffdddd|T4.70
|bgcolor=#ffdddd|5
|bgcolor=#ffdddd|
|bgcolor=#ffdddd|Westbound exit and eastbound entrance; signed as exits 5A (north) and 5B (south)
|-
|5.47
|5C
|
|Signed as exit 5 eastbound
|-
|6.37
|6
|
|Signed as exits 6A (south) and 6B (north) eastbound
|-
|rowspan=2|South San Francisco
South San Francisco, California
South San Francisco is a city in San Mateo County, California, United States, located on the San Francisco Peninsula in the San Francisco Bay Area...
|bgcolor=#ffdddd|6.76
|bgcolor=#ffdddd|7
|bgcolor=#ffdddd|South Airport Boulevard
|bgcolor=#ffdddd|Eastbound exit and westbound entrance
|-
|bgcolor=#ffdddd|6.76
|bgcolor=#ffdddd|
|bgcolor=#ffdddd|North Access Road
|bgcolor=#ffdddd|Eastbound exit and westbound entrance