California State Route 84

State Route 84
Defined by S&HC § 384, maintained by Caltrans
Length:	96 mi[1] (154 km)
South end:	SR 1 at San Gregorio
Major junctions:	I-280 at Woodside US 101 in Redwood City I-680 near Sunol I-580 in Livermore SR 12 in Rio Vista
North end:	I-80 in West Sacramento
State highways in California (list - pre-1964) < SR 83 SR 85 > History - Unconstructed - Deleted - Freeway - Scenic

State Route 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 western end of the Dumbarton Bridge to the interchange with I-880 has been upgraded to a freeway.

The other section is a north-west 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.

This route is part of the California Freeway and Expressway System^[2] and is eligible for the State Scenic Highway System^[3].

Route description

This section requires expansion.

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

Downtown La Honda on State Route 84.

Major intersections

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 numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile [4][5][6]	#[7]	Destinations	Notes
San Mateo SM 0.00-R30.15	San Gregorio	0.00		SR 1
	Woodside	14.95		SR 35 (Skyline Boulevard) – San Francisco, Santa Cruz
		21.54		I-280 (Junipero Serra Freeway) – San Francisco, San Jose	Interchange
	Redwood City	22.68		Alameda de las Pulgas
		24.70		SR 82 (El Camino Real)	Interchange
		25.72 101 5.39		US 101 north (Bayshore Freeway) / Seaport Boulevard – San Francisco	Interchange; south end of US 101 overlap
		South end of freeway on US 101
	Menlo Park	North end of freeway on US 101
		101 3.59 R25.81		US 101 south (Bayshore Freeway) / Marsh Road – San Jose, Atherton	Interchange; north end of US 101 overlap
		R27.66		Willow Road (SR 114) – Menlo Park
		R28.19		University Avenue (SR 109) – East Palo Alto
		South end of freeway
		Dumbarton Bridge over San Francisco Bay
Alameda ALA R0.00-R28.63	Newark
		R3.75	36	Thornton Avenue, Paseo Padre Parkway
		R4.88	37	Newark Boulevard, Ardenwood Boulevard
		R6.01 880 10.30		I-880 north (Nimitz Freeway) / Decoto Road – Oakland	Interchange; south end of I-880 overlap
	Fremont	North end of freeway on I-880
		880 8.84 6.92		I-880 south (Nimitz Freeway) / Thornton Avenue – San Jose	Interchange; north end of I-880 overlap
		8.02		Thornton Avenue, Fremont Boulevard
		8.33		Fremont Boulevard, Peralta Boulevard
		9.92		Mowry Avenue – Civic Center
		10.82 238 3.31		SR 238 south (Mission Boulevard) – San Jose	South end of SR 238 overlap
		238 3.64 10.83		SR 238 north (Mission Boulevard) / Niles Boulevard – Hayward, Union City	North end of SR 238 overlap
	Sunol	16.93		Sunol (Main Street)	Interchange; northbound exit and southbound entrance
		17.99 680 R11.04		I-680 south / Calaveras Road – Fremont, San Jose	Interchange; south end of I-680 overlap
	South end of freeway on I-680
	North end of freeway on I-680
		680 R11.85 R17.99		I-680 north – Walnut Creek, Sacramento	Interchange; north end of I-680 overlap; no northbound entrance
	Pleasanton	23.56		Vallecitos Road – Downtown Livermore	Former SR 84 north
	Livermore	R26.22		Stanley Boulevard	Interchange
		M27.75		Airway Boulevard, Kitty Hawk Road
		R28.63		I-580 / Collier Canyon Road – Oakland, Stockton	Interchange
Gap in SR 84
Solano SOL 0.13-13.67	Rio Vista	0.13		SR 12 – Lodi, Fairfield	Interchange
		2.49	Ryer Island Ferry across Cache Slough
		7.25		SR 220 east – Ryde
		12.08		Ryer Road East – Ryde
Yolo YOL 0.00-24.05		4.57		Courtland Road – Courtland, Rio Vista
		9.53		CR E19 (Clarksburg Road) – Clarksburg
		15.69	North end of state maintenance at West Sacramento city limit
	West Sacramento
		19.65		Linden Road
		19.85		Lake Washington Boulevard
		R21.78		I-80 Bus. (Capital City Freeway, US 50) – San Francisco, Sacramento	Interchange
		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
		24.05		I-80 to I-5 – Reno, San Francisco	Interchange
		24.05		Reed Avenue	Continuation beyond I-80

References

External links

• California @ WestCoastRoads - State Route 84
• Caltrans: Route 84 highway conditions
• Caltrans: Mid-State Tollway
• California Highways: SR 84