Bridge conditions in Nevada County, California
137 inventoried bridges · 19 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 137 Nevada County bridges in the federal inventory, 19 carry a poor rating. That 13.9% share is roughly 2x the national average.
- 19 of the 137 bridges in Nevada County, California, are rated in poor condition (13.9%) in the 2025 National Bridge Inventory, as of .
- 63 bridges (46.0%) are rated good and 55 (40.1%) fair.
- The median Nevada County bridge was built in 1969.
- The busiest poor-rated bridge is Interstate 80 WB over South Yuba River (built 1962), carrying about 12,400 vehicles a day.
Good 46.0% · Fair 40.1% · Poor 13.9% of 137 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 80 WB over South Yuba River | 1962 | 12,400 | Poor |
| Broad St over Deer Creek | 1967 | 8,630 | Poor |
| Sacramento St over State Route 20 | 1967 | 8,500 | Poor |
| Wolf Road (CR 10) over Wolf Creek | 1968 | 6,332 | Poor |
| Interstate 80 WB over SR 20 UP RR BNSF Amtrak | 1963 | 5,875 | Poor |
| Interstate 80 EB over SR 20 UP RR BNSF Amtrak | 1963 | 5,875 | Poor |
| Penn Valley Drive over Clear Creek | 1931 | 5,673 | Poor |
| Nevada Street over Deer Creek | 1938 | 3,300 | Poor |
| Limekiln Road over Wolf Creek | 1988 | 2,281 | Poor |
| You Bet Road over Greenhorn Creek | 1995 | 2,087 | Poor |
| Washington Rd over South Yuba River | 1971 | 263 | Poor |
| Eagle Lake Road over South Yuba River | 1962 | 250 | Poor |
| Bloomfield Rd over South Yuba River | 1904 | 143 | Poor |
| Rock Creek Rd over Rock Creek | 1920 | 80 | Poor |
| Hirschdale Rd over Truckee River | 1926 | 70 | Poor |
| Hirschdale Rd over UP RR BNSF Ry & Amtrak | 1926 | 70 | Poor |
| Rector Rd over Rock Creek | 1915 | 62 | Poor |
| Tyler Foote Xing over Middle Yuba River | 1958 | 58 | Poor |
| Relief Hill Rd over Humbug Creek | 1952 | 27 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 20 over Idaho-maryland Road | 1969 | 47,000 | Fair |
| State Route 20 over Wolf Creek | 1969 | 47,000 | Good |
| State Route 20 over SR 174 (colfax) Auburn | 1970 | 43,000 | Good |
| State Route 20 over Bank Street | 1969 | 34,500 | Good |
| State Route 20 over Bennett Street | 1969 | 34,500 | Fair |
| Interstate 80 over Donner Pass Road | 1991 | 34,000 | Fair |
| Interstate 80 over Bridge Street | 2003 | 34,000 | Good |
| Interstate 80 over State Route 89 | 1991 | 31,000 | Good |
| Interstate 80 over Truckee River | 2004 | 28,000 | Fair |
| Interstate 80 over Truckee River | 2004 | 28,000 | Fair |
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.