California State Route 84

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State Route 84 marker

State Route 84
SR 84 highlighted in red
Route information
Defined by Streets and Highways Code § 384
Maintained by Caltrans
Length 96 mi[2] (154 km)
Restrictions
Section 1
West end SR 1 at San Gregorio
Major
junctions
East end I-580 in Livermore
Section 2
South end SR 12 in Rio Vista
North end I-80 in West Sacramento
Location
Counties San Mateo, Alameda, Solano, Yolo
Highway system
SR 83SR 85

State Route 84 (SR 84) is 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. There are no plans to finish the unconstructed portion of the highway at this time.

Route description[edit]

Downtown La Honda on State Route 84.

Southern section[edit]

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.[3]

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 Ave, 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. Parts of the valley are extremely narrow and are referred to as Niles Canyon; this part of the route is now officially a scenic route.[4] After exiting the valley, it begins an overlap with I-680. 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. Here, one must turn left onto Isabel Avenue to stay on the highway. CA 84 then 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.

Northern section[edit]

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.[5]

SR 84 is part of the California Freeway and Expressway System,[6] but is not part of the National Highway System,[7] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[8] SR 84 is eligible for the State Scenic Highway System,[9] and is designated as a scenic highway by the California Department of Transportation from SR 238 to I-680 in Alameda County,[10] 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.[11]

History[edit]

Original routing[edit]

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[edit]

Mid-State Tollway[edit]

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.[12]

CA-84 widening project[edit]

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.[13] The project was to be done in five phases:

  1. Isabel Avenue/I-580 interchange
  2. Jack London Boulevard to Concannon Boulevard, including connections to Stanley Boulevard
  3. Concannon Boulevard to Vallecitos Road intersection and southern Ruby Hill entrance
  4. Northern side of pass
  5. Southern side of pass to I-680

Costs were estimated to be between $400 and $500 million.[14]

As of late 2017, phases 1, 2, and 4 are complete. This still leaves much of CA 84 in its original condition.

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).[15] 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
[15][2][16]
Exit
[17]
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 City24.70 SR 82 (El Camino Real)Interchange
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 ParkEast 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 MateoAlameda
county line
Menlo ParkNewark lineDumbarton 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
FremontEast 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
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
I-580 / Isabel Avenue to Portola Avenue – Oakland, StocktonInterchange; I-580 exit 51
Gap in route
Solano
SOL 0.13-13.67
Rio Vista0.13 SR 12 / Front Street – Lodi, Fairfield, Rio VistaInterchange
2.49Ryer Island Ferry across Cache Slough
7.25 SR 220 east – Ryde
Yolo
YOL 0.00-24.05
9.53 CR E19 (Clarksburg Road) – Clarksburg
West Sacramento15.69North end of state maintenance at West Sacramento city limit
R21.78 US 50 (Capital City Freeway) – San Francisco, SacramentoInterchange; former I-80; 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
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. ^ 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.

See also[edit]

References[edit]

  1. ^ "Special Route Restrictions". Caltrans. Retrieved 2014-07-28. 
  2. ^ a b California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation. 
  3. ^ Coté, John (April 23, 2007). "Author David Halberstam killed in Menlo Park". San Francisco Chronicle. Retrieved 23 April 2007. 
  4. ^ "California State Route 84--newest Scenic Highway". AMERICAN ROAD® FORUM—the ultimate road trip planning community. Copyright AMERICAN ROAD, LLC 2006-2015. Retrieved 2017-12-06. 
  5. ^ Garcia, Robert L. (May 21, 2003). "Memorandum" (PDF). 90(2.3c1).pdf. CalTrans. pp. 1–2. Retrieved 12 June 2016. 
  6. ^ California State Legislature. "Section 250–257". Streets and Highways Code. Sacramento: California State Legislature. Retrieved June 9, 2017. 
  7. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 9, 2017. 
  8. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012. 
  9. ^ California State Legislature. "Section 260–284". Streets and Highways Code. Sacramento: California State Legislature. Retrieved June 9, 2017. 
  10. ^ California Department of Transportation (September 7, 2011). "Officially Designated State Scenic Highways and Historic Parkways". Sacramento: California Department of Transportation. Retrieved October 9, 2017. 
  11. ^ California Department of Transportation (2012). Scenic Highway Guidelines (PDF). Sacramento: California Department of Transportation. p. 5. Retrieved June 8, 2017. 
  12. ^ "Mid-State Tollway". CalTrans. Retrieved 12 June 2016. 
  13. ^ "Isabel Avenue/State Route 84 Widening to Begin Monday". Livermore, CA Patch. 2012-06-15. Retrieved 2017-12-06. 
  14. ^ "Isabel Widening Information" (PDF). 
  15. ^ 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. 
  16. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2003, 2005, and 2006
  17. ^ California Department of Transportation, California Numbered Exit Uniform System, SR-84 Northbound and SR-84 Southbound, accessed February 2008

External links[edit]

Route map: Google

KML is from Wikidata