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Bridge conditions in Contra Costa County, California

622 inventoried bridges · 56 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

56 of the 622 bridges the federal inventory lists in Contra Costa County are rated poor; the rest split 260 good and 306 fair.

56 of the 622 bridges in Contra Costa County, California, are rated in poor condition (9.0%) in the 2025 National Bridge Inventory, as of August 20, 2026.
260 bridges (41.8%) are rated good and 306 (49.2%) fair.
The median Contra Costa County bridge was built in 1972.
The busiest poor-rated bridge is Interstate 680 over Monument Boulevard (built 1998), carrying about 235,000 vehicles a day.

Good 41.8% · Fair 49.2% · Poor 9.0% of 622 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
Interstate 680 over Monument Boulevard	1998	235,000	Poor
Interstate 680 over Laurel Drive	1964	192,200	Poor
Interstate 80 over El Portal Drive	1956	179,000	Poor
Interstate 80 over State Route 4 & Ramps	1958	179,000	Poor
Interstate 680 over Grayson Creek	1962	169,000	Poor
Interstate 680 over Willow Pass Road	1962	130,000	Poor
Interstate 680 over Center Ave	1962	130,000	Poor
Interstate 680 over Blum Road	1962	118,000	Poor
Interstate 80 over Willow Avenue	1958	115,000	Poor
State Route 242 over Concord Avenue	1963	100,000	Poor
State Route 24 over Brown Avenue	1957	79,500	Poor
State Route 24 over El Nido Ranch Rd	1957	79,500	Poor
State Route 24 over Ebmud Aqueduct	1957	79,500	Poor
State Route 24 WB over Lafayette Sta Puc(bartd)	1970	79,500	Poor
Interstate 580 over BNSF Ry South Second St	1990	69,000	Poor
S680-w24 Connector over N680-w24 Camino Diablo	1997	65,000	Poor
N680-n242 Connectr over Walnut Creek	1963	63,800	Poor
Interstate 680 NB over UPRR Marina Vista Mococo	2006	51,000	Poor
North Main Street over Interstate 680	1996	36,800	Poor
E24-s680 Connector over Boulevard Way	1994	34,000	Poor
EB 4-sb 680 Conn over Grayson Creek	2005	28,700	Poor
Main Street over Contra Costa Canal	1977	28,500	Poor
I 580 EB over Castro Street	1988	27,500	Poor
I 580 WB over Castro Street	1990	27,500	Poor
Richmond Pkwy SB over Giant UP RR BNSF Amtrak	1995	27,000	Poor
Richmond Pkwy NB over Giant UP RR BNSF Amtrak	1995	27,000	Poor
EB Onramp over BNSF Ry & Garrard Blvd	1980	23,750	Poor
Appian Way SB over Interstate 80	1957	20,000	Poor
Bayview Avenue Oc over Interstate 580	1987	13,500	Poor
Church Lane over San Pablo Creek	1955	12,540	Poor
San Pablo Ave over BNSF Ry and Amtrak	1938	10,300	Poor
Railroad Ave over UP RR Parkside Railroad	1988	10,000	Poor
Cypress Road over Marsh Creek	1964	9,415	Poor
Byron Hwy over California Aqueduct	1964	8,387	Poor
N242-w4 Connector over State Routes 4 & 242	1978	8,300	Poor
Ayers Road over Mount Diablo Creek	1987	8,000	Poor
N680-pacheco Offrp over Interstate Route 680	1962	7,000	Poor
Creekside Dr over San Ramon Creek	1959	5,800	Poor
Shell Ave over Arroyo Del Hambre	1955	4,900	Poor
W580-central Off over Central Ave	1991	4,300	Poor
Delta Road over Marsh Creek	1965	4,147	Poor
Pleasant Hill Rd over Taylor Blvd	1956	4,125	Poor
Second Ave South over Grayson Creek	1954	3,419	Poor
Del Monte Dr over BNSF Ry	1965	3,124	Poor
Ferry Street over Arroyo Del Hambre	1940	3,000	Poor
La Gonda Way over San Ramon Creek	1950	2,800	Poor
Camino Sobrante over San Pablo Creek	1955	2,514	Poor
Canal Bl-w580 Onrp over BNSF Ry & Garrard Blvd	1980	2,450	Poor
Waterfront Rd over Pacheco Slough	1948	2,409	Poor
Moraga Blvd over Las Trampas Creek	1937	2,200	Poor
Oakland Boulevard over N680&e24-ygnacio Off Rmp	1997	2,000	Poor
North Lake Drive over Lake Alhambra	1961	1,500	Poor
St Francis Dr over Galindo Creek	1950	450	Poor
Jersey Island Rd over Dutch Slough	1949	188	Poor
Lindemann Rd over Delta-mendota Canal	1950	150	Poor
Waterfront Rd over Slough	1945	–	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Interstate 680 over Canal & Bike Path	1956	257,000	Fair
Interstate 680 over Monument Boulevard	1998	235,000	Poor
Interstate 680 over Parkside Drive	1960	235,000	Good
Interstate 680 over Rudgear Road	1964	197,400	Good
Interstate 680 over Livorna Road	1964	197,400	Good
Interstate 680 over Newell Avenue	1994	195,300	Fair
Interstate 680 over Olympic Boulevard	1994	195,300	Fair
Interstate 680 over Las Trampas Creek	1960	195,300	Fair
Interstate 680 over Lilac Drive	1960	195,300	Fair
Interstate 680 over South Main Street	1959	195,300	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

All of California: California bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.