Contra Costa County Bridge Report Card
Contra Costa County scores 71 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Contra Costa County, California
Contra Costa County has 622 bridges in the National Bridge Inventory, with 56 rated poor and 3 rated scour-critical. Its poor-condition share of 9.0% is above the 4.9% statewide average. Poor-condition bridges carry about 2,531,668 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Contra Costa County a Bridge Condition Exposure Score of 71/100 (C). The county has 622 bridges in the National Bridge Inventory, including 56 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 2,531,668 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 9.0% | 18.0 |
| Poor-condition traffic exposure | 25 | 12.6% of measured traffic | 9.5 |
| Scour-critical bridge share | 20 | 0.5% | 1.0 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.3 |
| Traffic-data completeness | 5 | 20,080,685 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 9.0% |
| State Poor-Condition Share | 4.9% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.5% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 2,531,668 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Contra Costa County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Interstate 680 over Monument Boulevard | Poor condition + traffic exposure | Poor | 235,000 | 1998 |
| Interstate 680 over Laurel Drive | Poor condition + traffic exposure | Poor | 192,200 | 1964 |
| Interstate 80 over El Portal Drive | Poor condition + traffic exposure | Poor | 179,000 | 1956 |
| Interstate 80 over State Route 4 & Ramps | Poor condition + traffic exposure | Poor | 179,000 | 1958 |
| Interstate 680 over Grayson Creek | Poor condition + traffic exposure | Poor | 169,000 | 1962 |
| Interstate 680 over Willow Pass Road | Poor condition + traffic exposure | Poor | 130,000 | 1962 |
| Interstate 680 over Center AVE | Poor condition + traffic exposure | Poor | 130,000 | 1962 |
| Interstate 680 over Blum Road | Poor condition + traffic exposure | Poor | 118,000 | 1962 |
| Interstate 80 over Willow Avenue | Poor condition + traffic exposure | Poor | 115,000 | 1958 |
| State Route 242 over Concord Avenue | Poor condition + traffic exposure | Poor | 100,000 | 1963 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.