Placer County Bridge Report Card
Placer County scores 84 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Placer County, California
Placer County has 349 bridges in the National Bridge Inventory, with 16 rated poor and 6 rated scour-critical. Its poor-condition share of 4.6% is at or below the 4.9% statewide average. Poor-condition bridges carry about 163,356 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Placer County a Bridge Condition Exposure Score of 84/100 (B). The county has 349 bridges in the National Bridge Inventory, including 16 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 163,356 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 | 4.6% | 9.2 |
| Poor-condition traffic exposure | 25 | 3.8% of measured traffic | 2.9 |
| Scour-critical bridge share | 20 | 1.7% | 3.4 |
| Average age vs national baseline | 10 | 49 years vs 48 nationally | 0.6 |
| Traffic-data completeness | 5 | 4,259,916 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 | 4.6% |
| State Poor-Condition Share | 4.9% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.7% |
| Average Bridge Age | 49 years |
| Poor-Condition Traffic Exposure | 163,356 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Placer County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Interstate 80 over Carpenter Road | Poor condition + traffic exposure | Poor | 29,000 | 1958 |
| Interstate 80 over Up Rr Bnsf Ry & Amtrak | Poor condition + traffic exposure | Poor | 29,000 | 1961 |
| Interstate 80 EB over Hampshire Rocks S Yuba R | Poor condition + traffic exposure | Poor | 27,000 | 1963 |
| Interstate 80 EB over Troy Road | Poor condition + traffic exposure | Poor | 13,500 | 1959 |
| Interstate 80 EB over Kingvale Road | Poor condition + traffic exposure | Poor | 13,500 | 1959 |
| Interstate 80 EB over Blue Canyon Road | Poor condition + traffic exposure | Poor | 13,500 | 1959 |
| Interstate 80 WB over Blue Canyon Road | Poor condition + traffic exposure | Poor | 13,250 | 1959 |
| State Route 89 over Truckee River | Poor condition + traffic exposure | Poor | 11,100 | 1928 |
| Auburn-forsthillrd over N Fk American River | Poor condition + traffic exposure | Poor | 7,318 | 1973 |
| Brace Road over Secret Ravine | Poor condition + traffic exposure | Poor | 2,595 | 1939 |
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.