State Route 84 (California)
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State Route 84 (SR 84) is a
state highway A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either Route number, numbered or maintained by a sub-national state or province. A road numbered ...
in the
U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...
of
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
that consists of two unconnected segments, one in the
San Francisco Bay Area The San Francisco Bay Area, commonly known as the Bay Area, is a List of regions of California, region of California surrounding and including San Francisco Bay, and anchored by the cities of Oakland, San Francisco, and San Jose, California, S ...
and the other primarily in the
Sacramento–San Joaquin River Delta The Sacramento–San Joaquin River Delta, or California Delta, is an expansive inland river delta and estuary in Central California and Northern California Northern California (commonly shortened to NorCal) is a geocultural region that ...
area. The first section is an east–west
arterial road An arterial road or arterial thoroughfare is a high-capacity urban road that sits below highway A highway is any public or private road or other public way on land. It includes not just major roads, but also other public roads and rights o ...
running from SR 1 in San Gregorio to Menlo Park, across the Dumbarton Bridge through Fremont and Newark and ending at I-580 in Livermore. The segment between Marsh Road and the Dumbarton Bridge has been upgraded to an expressway and is known as the Bayfront Expressway. The segment from the eastern end of the Dumbarton Bridge to the interchange with I-880 has been upgraded to a freeway. The other section is a north-south arterial road that begins at SR 12 in Rio Vista, passes through Ryer Island (where it connects to SR 220), and ends in
West Sacramento West Sacramento (also known as West Sac) is a city in Yolo County, California, United States. The city is separated from Sacramento by the Sacramento River, which also separates Sacramento and Yolo counties. The population was 53,915 at the 2 ...
. The Ryer Island Ferry provides the crossing over Cache Slough from Rio Vista to Ryer Island. The ferry is a diesel-powered boat operated by
Caltrans The California Department of Transportation (Caltrans) is an Executive (government), executive department of the U.S. state of California. The department is part of the Government of California#State agencies, cabinet-level California State Tran ...
, and is in operation twenty-four hours per day and charges no toll. There are no plans to connect the two unconnected segments of SR 84 at this time. A proposed toll road called the Mid-State Tollway along the proposed route was abandoned in 2001 due to local opposition.


Route description


Southern section

The route begins at SR 1 on the
Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...
coast near San Gregorio. It then heads northeast through
San Mateo County San Mateo County ( ), officially the County of San Mateo, is a county (United States), county located in the U.S. state of California. As of the 2020 United States census, the population was 764,442. Redwood City, California, Redwood City is th ...
, following San Gregorio Road and La Honda Road and crossing the
Santa Cruz Mountains The Santa Cruz Mountains ( Mutsun Ohlone: Mak-sah-re-jah, "Sharp Ridged Mountain of the Eagle" or "People of the Eagle Mountain") are a mountain range in central and Northern California, United States, constituting a part of the Pacific Coast R ...
. As it enters Woodside, it intersects SR 35, also known as Skyline Boulevard. From the juncture of La Honda Road with Portola Road to US 101 it follows Woodside Road. It then passes through downtown Woodside. After intersecting
I-280 Interstate 280 may refer to multiple highways, all of which are or were related to Interstate 80: * Interstate 280 (California), a north–south freeway running from San Jose to San Francisco * Interstate 280 (Iowa–Illinois), part of the beltwa ...
, it enters
Redwood City Redwood City is a city on the San Francisco Peninsula in the Bay Area of Northern California, approximately south of San Francisco and northwest of San Jose. The city's population was 84,292 according to the 2020 census. The Port of Redwo ...
, where it intersects SR 82, which carries El Camino Real through the South Bay. A few miles later, it interchanges with
US 101 U.S. Route 101, or U.S. Highway 101 (US 101), is a major north–south highway that traverses the states of California, Oregon, and Washington on the West Coast of the United States. It is part of the United States Numbered Highway Syst ...
, which it overlaps for a few miles. Upon routing eastward, it enters the city of Menlo Park as an expressway, called the Bayfront Expressway, which features traffic signals at Menlo Park streets, at
driveway A driveway (also called ''drive'' in UK English) is a private road for local access to one or a small group of structures owned and maintained by an individual or group. Driveways rarely have traffic lights, but some may if they handle heavy ...
s serving
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headquarters, and at intersections with SR 114 and SR 109. The Marsh Road intersection, in 2013, was the site where a car struck cyclist Sam Felder , a Facebook employee, after he ran a red light. He died 3 months later. The SR 114 (Willow Road) intersection was the site of a car crash in which author
David Halberstam David Halberstam (April 10, 1934 April 23, 2007) was an American writer, journalist, and historian, known for his work on the Vietnam War, politics, history, the Civil Rights Movement, business, media, American culture, Korean War, and late ...
was killed on April 23, 2007. SR 84 then becomes a freeway at the south end of San Mateo County as it crosses as the Dumbarton Bridge over the
San Francisco Bay San Francisco Bay (Chochenyo language, Chochenyo: 'ommu) is a large tidal estuary in the United States, U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, California, San ...
. Midway over the bridge, it enters
Alameda County Alameda County ( ) is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland. A ...
. In
Alameda County Alameda County ( ) is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland. A ...
, it runs northward through the city of Newark, where it begins a concurrency southwards with I-880 for about one mile. Both interchanges with I-880 are
partial cloverleaf interchange A partial cloverleaf interchange or parclo is a modification of a cloverleaf interchange. The design has been well received, and has since become one of the most popular freeway-to-arterial interchange designs in North America. It has also bee ...
s. Upon separation, however, the route is not built to freeway standards as it enters the city of Fremont, following the streets of Thornton Avenue, Fremont Boulevard, Peralta Boulevard, and Mowry Avenue, which after, it has a short concurrency northwards with SR 238. SR 84 then leaves Fremont through the historic
Sunol Valley Sunol Valley () is located in Alameda County, California, United States. The small town of Sunol lies in the valley. It is largely rural, but is in proximity to the highly populated Bay Area suburbs of Fremont, Pleasanton, and Livermore. Des ...
. Parts of the valley are extremely narrow and are referred to as
Niles Canyon Niles Canyon is a canyon in the San Francisco Bay Area formed by Alameda Creek, known for its heritage railroad and silent movie history. The canyon is largely in an unincorporated area of Alameda County, while the western portion of the cany ...
; this part of the route is officially a
scenic route A scenic route, tourist road, tourist drive, scenic byway, or holiday road is a specially designated road or waterway that travels through an area of natural or cultural beauty. It often passes by scenic viewpoints. The designation is usually de ...
. The section is known as Niles Canyon Road, and there are legends of a Niles Canyon ghost inhabiting the area. After exiting the valley, it begins an overlap with
I-680 Interstate 680 may refer to: *Interstate 680 (California), a connecting freeway between I-80 and I-280 in the San Francisco Bay Area, California *Interstate 680 (Nebraska–Iowa), a bypass in Omaha, Nebraska *Interstate 680 (Ohio), a loop through ...
. After separating, it runs through Vallecitos Valley. It then goes over grasslands until it reaches a pass, then enters the city of Livermore with Ruby Hill development on the left. SR 84 then runs along Isabel Avenue until it meets I-580, as the end of its southern section. SR 84 is unconstructed from I-580 to SR 12.


Northern section

The second section of SR 84 starts in Rio Vista at SR 12. It then follows the Ryer Island Ferry, which carries the route across the Cache Slough. When it leaves the ferry, it intersects SR 220. It continues northward and meets the end of state maintenance at the
West Sacramento West Sacramento (also known as West Sac) is a city in Yolo County, California, United States. The city is separated from Sacramento by the Sacramento River, which also separates Sacramento and Yolo counties. The population was 53,915 at the 2 ...
city limit, about six miles east of an intersection with CR E19. It then enters the city of
West Sacramento West Sacramento (also known as West Sac) is a city in Yolo County, California, United States. The city is separated from Sacramento by the Sacramento River, which also separates Sacramento and Yolo counties. The population was 53,915 at the 2 ...
in
Yolo County Yolo County (; Wintun: ''Yo-loy''), officially the County of Yolo, is a county located in the northern portion of the U.S. state of California. Yolo County was one of the original counties of California, created in 1850 at the time of statehood ...
. It then interchanges with I-80 Business, also signed as
US 50 U.S. Route 50 or U.S. Highway 50 (US 50) is a major east–west route of the U.S. Highway system, stretching from Interstate 80 (I-80) in West Sacramento, California, to Maryland Route 528 (MD 528) in Ocean City, Maryland, on the Atlantic ...
. As it continues northward, it ends at
I-80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
. From north of West Sacramento, SR 84 has been relinquished and was given to the city of West Sacramento in 2003. SR 84 is part of the
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 encompasses both state highways and federal highways in California. It was defined by Article 2 (comme ...
, and from I-280 to the eastern Fremont city limits and from the southern terminous of Isabel Avenue in Livermore to I-580 is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the
Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
. SR 84 is eligible for the State Scenic Highway System, and is designated as a scenic highway by the
California Department of Transportation The California Department of Transportation (Caltrans) is an Executive (government), executive department of the U.S. state of California. The department is part of the Government of California#State agencies, cabinet-level California State Tran ...
from SR 238 to I-680 in Alameda County, meaning that it is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.


History


Original routing

Until recent years, all of CA-84 consisted of narrow, two-lane roads in California. This has remained almost unchanged except for urban areas and the CA-84 widening project in the Tri-Valley.


Modern history


Mid-State Tollway

Route 84 is legally defined to continue from I-580 to SR 4 in
Antioch Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
, but there are currently no plans in place to bridge the gap at this time. A plan to build a $600 million
toll road A toll road, also known as a turnpike or tollway, is a public or private road for which a fee (or ''Toll (fee), toll'') is assessed for passage. It is a form of road pricing typically implemented to help recoup the costs of road construction and ...
called the Mid-State Tollway along the proposed route was suspended in 2001 due to local opposition.


CA-84 widening project

In the late 2000s and 2010s, a widening project began on Route 84 from I-680 near Sunol to I-580 in Livermore. This included a better connection between Stanley Boulevard and Isabel Avenue. The project was to be done in five phases: # Isabel Avenue/I-580 interchange # Jack London Boulevard to Concannon Boulevard, including connections to Stanley Boulevard # Concannon Boulevard to Vallecitos Road intersection and southern Ruby Hill entrance # Northern side of pass # Southern side of pass to I-680 Costs were estimated to be between $400 and $500 million. As of mid 2019, phases 1, 2, 3 and 4 are complete. This still leaves the southern section of CA 84 in its original condition.


Ryer Island Ferry

Both the Ryer Island Ferry and the Howard Landing Ferry along Route 220 are the only state-run ferries, and there are no plans to replace them with bridges due to the low traffic numbers around Ryer Island. The only road bridge connecting Ryer Island is on its north side, which results in longer commutes for residents if one or both ferries shutdown.


Major intersections


See also

* *


References


External links

{{CASR external links, SR, 84
Bay Area FasTrak
– includes toll information on the Dumbarton Bridge and the other Bay Area toll facilities
Caltrans: Delta Ferries
– includes information on the Ryer Island Ferry

084 Area codes 084 and 086 are Nigerian telephone area codes serving the cities of Port Harcourt and Ahoada in Rivers State. They fall under the Southeast Zone in the National Numbering Plan (NNP) restructured in 2003. When in Port Harcourt or Ahoad ...
084 Area codes 084 and 086 are Nigerian telephone area codes serving the cities of Port Harcourt and Ahoada in Rivers State. They fall under the Southeast Zone in the National Numbering Plan (NNP) restructured in 2003. When in Port Harcourt or Ahoad ...
084 Area codes 084 and 086 are Nigerian telephone area codes serving the cities of Port Harcourt and Ahoada in Rivers State. They fall under the Southeast Zone in the National Numbering Plan (NNP) restructured in 2003. When in Port Harcourt or Ahoad ...
State Route 084 State Route 084 State Route 084 State Route 084