San Joaquin County Bridge Report Card
San Joaquin County scores 66 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
San Joaquin County, California
San Joaquin County has 655 bridges in the National Bridge Inventory, with 63 rated poor and 10 rated scour-critical. Its poor-condition share of 9.6% is above the 4.9% statewide average. Poor-condition bridges carry about 1,288,788 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives San Joaquin County a Bridge Condition Exposure Score of 66/100 (D). The county has 655 bridges in the National Bridge Inventory, including 63 in poor condition and 10 rated scour-critical. Poor-condition bridges carry about 1,288,788 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 | 9.6% | 19.2 |
| Poor-condition traffic exposure | 25 | 11.1% of measured traffic | 8.3 |
| Scour-critical bridge share | 20 | 1.5% | 3.1 |
| Average age vs national baseline | 10 | 57 years vs 48 nationally | 3.7 |
| Traffic-data completeness | 5 | 11,589,612 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 | 9.6% |
| State Poor-Condition Share | 4.9% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.5% |
| Average Bridge Age | 57 years |
| Poor-Condition Traffic Exposure | 1,288,788 vehicles/day |
Bridges to Watch
Top Bridges to Watch in San Joaquin County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Escalon Bellota RD over Mormon Slough | Poor condition + traffic exposure | Poor | 2,430 | 1966 |
| Buckman RD over Duck Creek | Poor condition + traffic exposure | Poor | 179 | 1931 |
| Interstate 5 NB over Brookside Calaveras Riv | Poor condition + traffic exposure | Poor | 124,000 | 1968 |
| Interstate 5 over Monte Diablo AVE | Poor condition + traffic exposure | Poor | 113,000 | 1970 |
| Interstate 5 SB over Weber Pershing Fremont | Poor condition + traffic exposure | Poor | 113,000 | 1972 |
| Interstate 5 NB over Paradise Cut Uc | Poor condition + traffic exposure | Poor | 80,000 | 1971 |
| Interstate 5 NB over Weber Pershing Fremont | Poor condition + traffic exposure | Poor | 56,500 | 1972 |
| Interstate 5 NB over Mosher Slough | Poor condition + traffic exposure | Poor | 48,000 | 1975 |
| Interstate 5 SB over Walker Slough | Poor condition + traffic exposure | Poor | 43,750 | 1971 |
| West Lane over Calaveras River | Poor condition + traffic exposure | Poor | 41,000 | 1966 |
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.