California State Route 84

State Route 84 marker

State Route 84
Route information
Defined by Streets and Highways Code § 384
Maintained by Caltrans
Length: 96 mi[1] (154 km)
Restrictions:
Section 1
West end: SR 1 at San Gregorio
Major
junctions:		 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 83SR 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 US 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 SR 12 in Rio Vista, passes through Ryer Island (where it connects to SR 220), and ends at the I-80 interchange in West Sacramento. 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 SR 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.[3]

Route description

This route is part of the California Freeway and Expressway System[4] and is eligible for the State Scenic Highway System.[5] It is designated as a State Scenic Highway from SR 238 to I-680 in Alameda County.[6]

Downtown La Honda on State Route 84.

The route begins at SR 1 on the Pacific coast near San Gregorio. It then heads northeast through San Mateo County crossing the Santa Cruz Mountains. As it enters Woodside, where it intersects SR 35, also known as Skyline Boulevard, then I-280. 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 US 101, which it overlaps for a few miles. Upon routing eastward, it enters the city of Menlo Park as an expressway, called the Bayfront Expressway where it intersects SR 114 and SR 109 at grade intersections. The SR 114 (Willow Road) intersection was the site of the car crash in which author David Halberstam was killed on April 23, 2007.[7]

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

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. Midway over the bridge, it enters Alameda County. In Alameda County, 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 interchanges. Upon separation, the route isn't upgraded to freeway standards as it enters the city of Fremont, following the streets of Thornton Boulevard, Fremont Blvd, Peralta Blvd, and Mowry Ave, which after, it has a short concurrency northwards with SR 238. SR 84 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. SR 84 is unconstructed from I-580 to SR 12.

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

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 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 US 50. As it continues northward, it ends at I-80. From north of West Sacramento, SR 84 has been relinquished and given to the city of West Sacramento in 2003.[8]

Major intersections

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).[9] 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.

CountyLocationPostmile
[9][10][11]		Exit
[12]		DestinationsNotes
San Mateo
SM 0.00-R30.15		San Gregorio0.00 SR 1 – Half Moon Bay, Santa Cruz
Woodside14.95 SR 35 (Skyline Boulevard) – San Francisco, Santa Cruz
21.54 I-280 (Junipero Serra Freeway) – San Francisco, San JoseInterchange; I-280 exit 25
Redwood City22.68Alameda de las Pulgas
24.70 SR 82 (El Camino Real)Interchange
25.06Middlefield Road – Downtown Redwood City
5.72
5.39[N 1]		 US 101 north (Bayshore Freeway) / Seaport Boulevard – San FranciscoInterchange; 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]
R25.81		 US 101 south (Bayshore Freeway) / Marsh Road – San Jose, AthertonInterchange; 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
county line		Menlo Park–Newark line​Dumbarton Bridge over San Francisco Bay
Alameda
ALA R0.00-R28.63		NewarkR3.7536Thornton Avenue, Paseo Padre Parkway
R4.8837Newark Boulevard, Ardenwood Boulevard
R6.01
10.30[N 2]		 I-880 north (Nimitz Freeway) / Decoto Road – OaklandInterchange; west end of I-880 overlap; I-880 exit 21
Fremont​East end of freeway on I-880
8.84[N 2]
6.92		 I-880 south (Nimitz Freeway) / Thornton Avenue – San JoseInterchange; east end of I-880 overlap; I-880 exit 19
8.02Thornton Avenue, Fremont Boulevard
8.33Fremont Boulevard, Peralta Boulevard
9.92Mowry Avenue – Civic Center
10.82
3.31[N 3]		 SR 238 south (Mission Boulevard) – San JoseWest end of SR 238 overlap
3.64[N 3]
10.83		 SR 238 north (Mission Boulevard) / Niles Boulevard – Hayward, Union CityEast end of SR 238 overlap
Sunol16.93Sunol (Main Street)Interchange; eastbound exit and westbound entrance
​17.99
R11.04[N 4]		 I-680 south / Calaveras Road – Fremont, San JoseInterchange; 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]
17.99		 I-680 north – Walnut Creek, SacramentoEast end of I-680 overlap; I-680 north exit 21B, south via a U-turn at exit 21
​​East end of freeway
Pleasanton23.56Vallecitos Road – Downtown LivermoreFormer SR 84 east
LivermoreR26.22Stanley BoulevardInterchange
M27.75Airway Boulevard
​ I-580 / Isabel Avenue – Oakland, StocktonInterchange; I-580 exit 51
Gap in route
Solano
SOL 0.13-13.67		Rio Vista0.13 SR 12 / Front Street – Lodi, FairfieldInterchange
​2.49Ryer Island Ferry across Cache Slough
​7.25 SR 220 east – Ryde
​12.08Ryer Road East – Ryde
Yolo
YOL 0.00-24.05		​4.57Courtland Road – Courtland, Rio Vista
​9.53 CR E19 (Clarksburg Road) – Clarksburg
West Sacramento15.69North end of state maintenance at West Sacramento city limit
19.65Linden Road
19.85Lake Washington Boulevard
R21.78 I-80 Bus. (Capital City Freeway, US 50) – San Francisco, SacramentoInterchange; former I-80; I‑80 Bus./US 50 exit 3
21.84To Capitol Mall (SR 275, Tower Bridge Gateway)Interchange; former US 40 / US 99W
22.06West Capitol AvenueFormer US 40 / US 99W
22.68Sacramento Avenue, Kegle DriveSacramento Avenue was former SR 16 east
23.47Sunset Avenue – WoodlandFormer SR 16 west
23.67Harbor Boulevard
24.05 I-80 to I-5 – Reno, San FranciscoInterchange; former I-880; I-80 exit 83
24.05Reed AvenueContinuation beyond I-80
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. 1 2 Indicates that the postmile represents the distance along US 101 rather than SR 84.
  2. 1 2 Indicates that the postmile represents the distance along I-880 rather than SR 84.
  3. 1 2 Indicates that the postmile represents the distance along SR 238 rather than SR 84.
  4. 1 2 Indicates that the postmile represents the distance along I-680 rather than SR 84.

References

  1. ↑ January 1, 2006 California Log of Bridges on State Highways
  2. ↑ "Special Route Restrictions". Caltrans. Retrieved 2014-07-28.
  3. ↑ "Mid-State Tollway". CalTrans. Retrieved 12 June 2016.
  4. ↑ CA Codes (shc:250-257)
  5. ↑ CA Codes (shc:260-284)
  6. ↑ "Officially Designated State Scenic Highways". California Department of Transportation. October 14, 2013. Retrieved November 26, 2013.
  7. ↑ Coté, John (April 23, 2007). "Author David Halberstam killed in Menlo Park". San Francisco Chronicle. Retrieved 23 April 2007.
  8. ↑ Garcia, Robert L. (May 21, 2003). "Memorandum" (PDF). 90(2.3c1).pdf. CalTrans. pp. 1–2. Retrieved 12 June 2016.
  9. 1 2 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.
  10. ↑ California Department of Transportation, Log of Bridges on State Highways, July 2007
  11. ↑ California Department of Transportation, All Traffic Volumes on CSHS, 2003, 2005, and 2006
  12. ↑ California Department of Transportation, California Numbered Exit Uniform System, SR-84 Northbound and SR-84 Southbound, accessed February 2008
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