Los Angeles County Bridge Report Card
Los Angeles County scores 89 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Los Angeles County, California
Los Angeles County has 3,549 bridges in the National Bridge Inventory, with 94 rated poor and 7 rated scour-critical. Its poor-condition share of 2.6% is at or below the 4.9% statewide average. Poor-condition bridges carry about 3,689,010 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Los Angeles County a Bridge Condition Exposure Score of 89/100 (B). The county has 3,549 bridges in the National Bridge Inventory, including 94 in poor condition and 7 rated scour-critical. Poor-condition bridges carry about 3,689,010 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 | 2.6% | 5.3 |
| Poor-condition traffic exposure | 25 | 1.6% of measured traffic | 1.2 |
| Scour-critical bridge share | 20 | 0.2% | 0.4 |
| Average age vs national baseline | 10 | 59 years vs 48 nationally | 4.4 |
| Traffic-data completeness | 5 | 234,839,752 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 | 2.6% |
| State Poor-Condition Share | 4.9% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.2% |
| Average Bridge Age | 59 years |
| Poor-Condition Traffic Exposure | 3,689,010 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Los Angeles County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Malibu Cyn RD over Malibu Crk | Poor condition + traffic exposure | Poor | 20,753 | 1953 |
| State Route 1 over Trancas Creek | Poor condition + traffic exposure | Poor | 17,100 | 1927 |
| Interstate 110 over Slauson AVE & Bnsf Ry | Poor condition + traffic exposure | Poor | 300,000 | 1996 |
| U.s. Highway 101 over Kester AVE | Poor condition + traffic exposure | Poor | 293,000 | 1959 |
| Interstate 405 over Vermont AVE 190th ST | Poor condition + traffic exposure | Poor | 269,000 | 1962 |
| State Route 134 over Pacific AVE | Poor condition + traffic exposure | Poor | 240,000 | 1967 |
| RTE 110 over Torrance BLVD | Poor condition + traffic exposure | Poor | 218,000 | 1962 |
| Route 105 & Lrt over Wright Road | Poor condition + traffic exposure | Poor | 217,000 | 1993 |
| U.s. Highway 101 over Argyle Av & Franklin Av | Poor condition + traffic exposure | Poor | 175,000 | 1953 |
| US Highway 101 SB over Highland-nb 101 On Ramp | Poor condition + traffic exposure | Poor | 145,500 | 1954 |
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.