California State Route 84

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State Route 84 marker

State Route 84
Route information
Defined by Streets and Highways Code § 384
Maintained by Caltrans
Length: 96 mi[2] (154 km)
Section 1
West end: SR 1 at San Gregorio
I‑280 at Woodside
US 101 in Redwood City
I‑880 in Fremont
SR 238 in Fremont
I‑680 near Sunol
East end: I‑580 in Livermore
Section 2
South end: SR 12 in Rio Vista
North end: I‑80 in West Sacramento
Highway system
SR 83 SR 85

State Route 84 (SR 84) is a split-section California State Highway consisting of two sections. The first section is an east–west arterial road running from San Gregorio to Menlo Park, across the Dumbarton Bridge through Fremont and Newark and ending at I-580 in Livermore. The route overlaps the freeway segment of U.S. 101 between Woodside Road in Redwood City and Marsh Road in Menlo Park. 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 Route 12 in Rio Vista, passes through Ryer Island (where it connects to Route 220), and ends at the Interstate 80 interchange in West Sacramento. However, plans are underway to turn maintenance of SR 84 through West Sacramento to that city.

A ferry provides the crossing over Cache Slough from Rio Vista to Ryer Island. The ferry, a diesel-powered boat operated by Caltrans, is in operation twenty-four hours per day and charges no toll.

Route 84 is legally defined to continue from I-580 to Route 4 in Antioch, but there are currently no plans in place to bridge the gap at this time. A plan to build a $600 million toll road called the Mid-State Tollway along the proposed route was suspended in 2001 due to local opposition.

Route description[edit]

This route is part of the California Freeway and Expressway System[3] and is eligible for the State Scenic Highway System.[4] It is designated as a State Scenic Highway from State Route 238 to Interstate 680 in Alameda County.[5]

Dumbarton Bridge on State Route 84 as seen from Skeggs Point.

The route begins at SR 1 on the Pacific coast near San Gregorio. It then heads northward through San Mateo County crossing the Santa Cruz Mountains. As it enters Woodside, where it intersects SR 35, also known as Skyline Boulevard, and interchanges with Interstate 280 (California). It then enters Redwood City, where it intersects SR 82, which carries El Camino Real through the South Bay. A few miles later, it interchanges with U.S. Route 101, which it overlaps for several miles. Upon exiting, it enters the city of Menlo Park as an expressway, where it intersects SR 114 and SR 109 at intersections controlled by traffic lights. The SR 114 (Willow Road) intersection was the site of the car crash in which author David Halberstam was killed on April 23, 2007.

Route 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. Midway over the bridge, it enters Alameda County.

Downtown La Honda on State Route 84.

In Alameda County, it runs northward through the city of Newark, where it begins a concurrency with Interstate 880. Both interchanges with Interstate 880 are partial cloverleaf interchanges, meaning that through traffic on Route 84 encounters traffic lights while joining and leaving I-880. Upon separation, the route loses its freeway status as it enters the city of Fremont, where it has a short concurrency with SR 238. There are plans to construct a new parkway between the I-880 interchange and Mission Boulevard (CA 238), with land being held for the route and an interchange at Fremont Boulevard.

It then leaves Fremont through the historic Sunol Valley. After exiting the valley, it begins an overlap with I-680. After separating, it runs for several miles over a pass, then enters the city of Livermore; it runs along Isabel Ave until it meets I-580, as the end of its southern section.

Upon reappearing, the route begins at SR 12 in Rio Vista. 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 city limit, about six miles east of an intersection with CR E19. It then enters the city of West Sacramento in Yolo County. It then interchanges with I-80 Business, also signed as U.S. Route 50. As it continues northward, it ends at Interstate 80.

The I-80 East bound freeway signage indicating the California State Route 84 (unsigned) Eastern terminus at the Reed Ave interchange in West Sacramento

Major intersections[edit]

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).[6] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County Location Postmile
Destinations Notes
San Mateo
SM 0.00-R30.15
San Gregorio 0.00 SR 1 – Half Moon Bay, Santa Cruz
Woodside 14.95 SR 35 (Skyline Boulevard) – San Francisco, Santa Cruz
21.54 I‑280 (Junipero Serra Freeway) – San Francisco, San Jose Interchange; I-280 exit 25
Redwood City 22.68 Alameda de las Pulgas
24.70 SR 82 (El Camino Real) Interchange
25.06 Middlefield Road – Downtown Redwood City
5.39[N 1]
US 101 north (Bayshore Freeway) / Seaport Boulevard – San Francisco Interchange; west end of US 101 overlap; US 101 exit 408
  West end of freeway on US 101
Menlo Park   East end of freeway on US 101
3.59[N 1]
US 101 south (Bayshore Freeway) / Marsh Road – San Jose, Atherton Interchange; east end of US 101 overlap; US 101 exit 406
R27.66 SR 114 (Willow Road) to US 101 south – Menlo Park
R28.19 SR 109 (University Avenue) – East Palo Alto
  West end of freeway
  Ravenswood, S.F. Bay National Wildlife Refuge
San Mateo–
Alameda line
Menlo Park–
Newark line
  Dumbarton Bridge over San Francisco Bay
ALA R0.00-R28.63
Newark R3.75 36 Thornton Avenue, Paseo Padre Parkway
R4.88 37 Newark Boulevard, Ardenwood Boulevard
10.30[N 2]
I‑880 north (Nimitz Freeway) / Decoto Road – Oakland Interchange; west end of I-880 overlap; I-880 exit 21
Fremont   East end of freeway on I-880
8.84[N 2]
I‑880 south (Nimitz Freeway) / Thornton Avenue – San Jose Interchange; east end of I-880 overlap; I-880 exit 19
8.02 Thornton Avenue, Fremont Boulevard
8.33 Fremont Boulevard, Peralta Boulevard
9.92 Mowry Avenue – Civic Center
3.31[N 3]
SR 238 south (Mission Boulevard) – San Jose West end of SR 238 overlap
3.64[N 3]
SR 238 north (Mission Boulevard) / Niles Boulevard – Hayward, Union City East end of SR 238 overlap
Sunol 16.93 Sunol (Main Street) Interchange; eastbound exit and westbound entrance
R11.04[N 4]
I‑680 south / Calaveras Road – Fremont, San Jose Interchange; west end of I-680 overlap; I-680 north exit 21A, south exit 21
    West end of freeway on I-680
  R11.85[N 4]
I‑680 north – Walnut Creek, Sacramento East end of I-680 overlap; I-680 north exit 21B, south via a U-turn at exit 21
    East end of freeway
Pleasanton 23.56 Vallecitos Road – Downtown Livermore Former SR 84 east
Livermore R26.22 Stanley Boulevard Interchange
M27.75 Airway Boulevard
  I‑580 / Isabel Avenue – Oakland, Stockton Interchange; I-580 exit 51
Gap in route
SOL 0.13-13.67
Rio Vista 0.13 SR 12 / Front Street – Lodi, Fairfield Interchange
  2.49 Ryer Island Ferry across Cache Slough
  7.25 SR 220 east – Ryde
  12.08 Ryer Road East – Ryde
YOL 0.00-24.05
  4.57 Courtland Road – Courtland, Rio Vista
  9.53 CR E19 (Clarksburg Road) – Clarksburg
West Sacramento 15.69 North end of state maintenance at West Sacramento city limit
19.65 Linden Road
19.85 Lake Washington Boulevard
R21.78 I‑80 Bus. (Capital City Freeway, US 50) – San Francisco, Sacramento Interchange; former I-80; I‑80 Bus./US 50 exit 3
21.84 To Capitol Mall (SR 275, Tower Bridge Gateway) Interchange; former US 40 / US 99W
22.06 West Capitol Avenue Former US 40 / US 99W
22.68 Sacramento Avenue, Kegle Drive Sacramento Avenue was former SR 16 east
23.47 Sunset Avenue – Woodland Former SR 16 west
23.67 Harbor Boulevard
24.05 I‑80 to I‑5Reno, San Francisco Interchange; former I-880; I-80 exit 83
24.05 Reed Avenue Continuation beyond I-80
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b Indicates that the postmile represents the distance along US 101 rather than SR 84.
  2. ^ a b Indicates that the postmile represents the distance along I-880 rather than SR 84.
  3. ^ a b Indicates that the postmile represents the distance along SR 238 rather than SR 84.
  4. ^ a b Indicates that the postmile represents the distance along I-680 rather than SR 84.


  1. ^ "Special Route Restrictions". Caltrans. Retrieved 2014-07-28. 
  2. ^ January 1, 2006 California Log of Bridges on State Highways
  3. ^ CA Codes (shc:250-257)
  4. ^ CA Codes (shc:260-284)
  5. ^ "Officially Designated State Scenic Highways". California Department of Transportation. October 14, 2013. Retrieved November 26, 2013. 
  6. ^ a b California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015. 
  7. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  8. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2003, 2005, and 2006
  9. ^ California Department of Transportation, California Numbered Exit Uniform System, SR-84 Northbound and SR-84 Southbound, accessed February 2008

External links[edit]

Route map: Bing / Google