INTERSTATE 680 (CALIFORNIA)

'Interstate 680' (abbreviated 'I-680') is a north-south interstate freeway in California's San Francisco Bay Area. I-680 spans just over 70 miles (113.4 km) from its southern terminus in San Jose to its northern terminus in Fairfield. The freeway serves as the outer East Bay's main connection to the North Bay and to northern areas of the Central Valley, including Sacramento. It and Interstate 280 form a partial beltway around the Bay Area.

Contents

Route description

History

Control cities

Major cities

Intersections With Other Interstates

Freeway Designations

State law

Exit list

References

See also

External links

Route description

I-680's southern terminus is at the U.S. 101/Interstate 280 interchange in San Jose. From there, it runs north to Fremont before it travels northeast to Sunol. 680 then goes on a roughly due north direction through the East Bay cities of Pleasanton, Dublin, San Ramon, Danville, Walnut Creek, Pleasant Hill, Concord, and Martinez. It then crosses the Carquinez Strait over the Benicia-Martinez Bridge into Benicia before terminating at the Cordelia Junction with Interstate 80 in Fairfield.
The portion of 680 from Sunol to Alamo is very close to the Calaveras Fault, and structures along and over the freeway may sustain significant damage in the event of a major earthquake on the Calaveras Fault.

History

I-680 succeeded State Route 21 as the primary Fremont-Benicia highway in the mid-1960s. At that time, I-680 was constructed between the newly truncated Route 21's terminus in Benicia and Interstate 80 (née US 40) in Vallejo. In 1976, that segment became Interstate 780, and the 680 designation was moved to the last remaining portion of Route 21, which connected Benicia to the Cordelia Junction in Fairfield.

Control cities

'Northbound'

★ Sacramento - Whole route
'Southbound'

★ San Jose - between I-80 and the San Jose city limits

★ Downtown San Jose - between the San Jose city limits and the US 101/I-280 interchange

Major cities

★ Fairfield

★ Benicia

★ Martinez

★ Concord

★ Pleasant Hill

★ Walnut Creek

★ Danville

★ San Ramon

★ Dublin

★ Pleasanton

★ Fremont

★ Milpitas

★ San Jose

Intersections With Other Interstates

★ Interstate 280 in San Jose

★ Interstate 580 in Dublin/Pleasanton

★ Interstate 780 in Benicia

★ Interstate 80 in Cordelia

Freeway Designations

★ Sinclair Freeway -- designation continues from I-280 in San Jose to I-580 in Dublin/Pleasanton or the Santa Clara/Alameda County line

★ Luther Gibson Freeway -- from Benicia-Martinez Bridge over Carquinez Strait to the I-80 terminus

State law

'Legal Definition of Route 680:' California Streets and Highways Code, Chapter 2, Article 3, Section 620

Exit list

Postmiles are derived from^[3] and exit numbers derived from^[4].

County	Location	Postmile		#	Destinations	Notes
		County	Statewide
Southbound traffic defaults onto I-280 north.
Santa Clara	San José	SCL 0.00	0.00	1A	– Downtown San José	Southbound left exit and northbound entrance
				1B		Southbound exit and northbound entrance
		SCL M0.38	0.38	1A	King Road	Exit 1C southbound
				1B	Jackson Avenue	Northbound exit and southbound entrance
		SCL M1.41	1.41	1C		Exit 1D southbound
		SCL M1.74	1.74	2A	() Alum Rock Avenue
		SCL M2.38	2.38	2B	McKee Road
		SCL M3.84	3.84	4	Berryessa Road
		SCL M4.79 SCL M5.07	4.79 5.07	5	Capitol Avenue; Hostetter Road	Split into Exit 5A (Hostetter Rd) and Exit 5B (Capitol Ave) northbound
	Milpitas	SCL M6.17 SCL M6.18	6.17 6.18	6
		SCL M7.64	7.64	8
		SCL M8.50	8.50	9	Jacklin Road
Alameda	Fremont	ALA M0.13	10.06	10	Scott Creek Road; Warm Springs District
		ALA M2.39	12.32	12	() , Mission Boulevard
		ALA M4.02	13.95	14	Durham Road; Auto Mall Parkway
		ALA M5.37	15.30	15	Washington Boulevard; Irvington District
		ALA R6.39	16.32	16
		ALA R7.48	17.41	18A	Vargas Road	Exit 18 southbound
		ALA R8.31	18.24	18B	Sheridan Road	Combined with exit 20 southbound, accessible via Mission Rd
		ALA R9.71	19.64	20	Andrade Road
		ALA R11.04	20.97	21A
		ALA R11.85	21.78	21B
		ALA R12.44	22.37	22	Sunol Road (Pleasanton-Sunol Road; Koopman Road)	Southbound exit and northbound entrance
	Pleasanton	ALA R15.26	25.19	25	Sunol Boulevard; Castlewood Drive (Pleasanton-Sunol Road)
		ALA R16.75	26.68	26	Bernal Avenue
		ALA R19.30	29.23	29	Stoneridge Drive
	Dublin	ALA R20.04	29.97	30
		ALA R20.39	30.32		Dublin Boulevard	No northbound exit
Contra Costa	San Ramon	CC R0.01	31.82	31	Alcosta Boulevard
		CC R2.88	34.69	34	Bollinger Canyon Road
		CC R4.18	35.99	36	Crow Canyon Road
	Danville	CC R6.76	38.57	38	Sycamore Valley Road
		CC R7.55	39.36	39	Diablo Road
		CC R8.18	39.99	40	El Cerro Boulevard
		CC R8.75	40.56	41	El Pintado Road	Southbound exit and northbound entrance
		CC R10.37	42.18	42A	Stone Valley Road - East
				42B	Stone Valley Road - West
		CC R11.28	43.09	43	Livorna Road
	Walnut Creek	CC R12.61	44.42	44	Rudgear Road	Northbound exit and southbound entrance; northbound entrance accessible via Danville Boulevard
		CC 13.08	44.89	45	South Main Street	Exit 45A northbound; No northbound entrance
		CC 13.93	45.74	45B	Olympic Boulevard
		CC 14.38	46.19	46A
		CC 14.85	46.66	46B	Ygnacio Valley Road	Northbound exit and southbound entrance
		CC 15.61	47.42	47	North Main Street	Southbound exit and northbound entrance accessible via San Luis Road; Northbound exit accessible via Pinneman Way; Northbound entrance accessible via Lawrence Way and/or Pinneman Way
		CC 16.40	48.21	48	Treat Boulevard; Geary Road	Southbound exit and entrance accessible via North Main Street; Northbound entrance accessible via Bushkirk Avenue and/or Oak Road
	Pleasant Hill	CC R17.40 CC R17.44	49.21 49.25	49A	Contra Costa Boulevard	Northbound exit and southbound entrance
		CC R17.70	49.51	49B	Monument Boulevard	Northbound exit
				49	Monument Boulevard; Gregory Lane	Southbound exit
	Concord	CC R18.71	50.52	50		Northbound exit and southbound entrance
		CC 19.04	50.85	51	Willow Pass Road
		CC 19.86	51.67	52	Concord Avenue; Burnett Avenue; Chilpancingo Parkway	Southbound exit via Contra Costa Boulevard
		CC 21.19	53.00	53
		CC 22.70	54.51	54	Pacheco Boulevard; Arthur Road
		CC 24.26	56.07	56	Marina Vista
Contra Costa-Solano county line		Benicia-Martinez Bridge over Carquinez Strait. $4.00 toll northbound.
Solano	Benicia	SOL M0.68	57.95	58A		Left exit northbound
		SOL R1.00	59.39	58B	Bayshore Road; Industrial Park	Northbound exit and southbound entrance
				60	Industrial Park (Industrial Way)	Southbound exit and northbound entrance
		SOL R2.82	61.21	61	Lake Herman Road
		SOL R5.02	63.41	63	Parish Road	Road serves to bridge frontage roads Lopes Road and Goodyear Road
		SOL R7.32	65.71	65	Marshview Road	road serves to bridge frontage roads Lopes Road and Goodyear Road
	Fairfield	SOL R10.02	68.41	68	Gold Hill Road
		SOL 12.63	71.02	70	Cordelia; Green Valley Road	Northbound exit only; Southbound entrance accessible via the I-80 eastbound entrance from Lopes Road
		SOL 13.13	71.52	71A		Northbound exit and southbound entrance
				71B		Northbound exit and southbound entrance

References

1. California Highways: Interstate Highway Types and the History of California's Interstates
2. California Highways: Interstate 780
3. January 1, 2006 California Log of Bridges on State Highways
4. Cal-NExUS Interchange Exit Numbering

See also

★ Benicia-Martinez Bridge

External links

★ California Highways: Interstate 680

★ Western Exit Guide - Interstate 680 California