Bridge conditions in Lake County, California
131 inventoried bridges · 12 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 131 bridges in Lake County: 40 rated good, 79 fair, and 12 poor.
- 12 of the 131 bridges in Lake County, California, are rated in poor condition (9.2%) in the 2025 National Bridge Inventory, as of .
- 40 bridges (30.5%) are rated good and 79 (60.3%) fair.
- The median Lake County bridge was built in 1966.
- The busiest poor-rated bridge is Nice-lucerne Cutof over Rodman Narrows(clear Lak (built 1958), carrying about 5,315 vehicles a day.
Good 30.5% · Fair 60.3% · Poor 9.2% of 131 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 |
|---|---|---|---|
| Nice-lucerne Cutof over Rodman Narrows(clear Lak | 1958 | 5,315 | Poor |
| Elk Mtn Rd over West Fork Middle Creek | 1966 | 1,000 | Poor |
| Road M1 over Eel River | 1971 | 350 | Poor |
| Big Canyon Road over Big Canyon Creek | 1930 | 308 | Poor |
| Big Canyon Road over Big Canyon Creek | 1930 | 304 | Poor |
| Big Canyon Rd over Big Canyon Creek | 1956 | 208 | Poor |
| Elk Mountain Rd over Soda Creek | 1979 | 169 | Poor |
| Bartlett Sprngs Rd over Bartlett Creek | 1950 | 108 | Poor |
| Road over Stream | 1962 | 50 | Poor |
| Wolf Creek Road over Wolf Creek | 1967 | 26 | Poor |
| S Cow Mtn -8 Mile over Panther Creek | 2000 | 25 | Poor |
| Chalk Mtn Rd over North Fork Cache Creek | 1967 | 15 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 53 over Seigler Creek | 1952 | 16,500 | Fair |
| State Route 29 over Kelsey Creek | 1966 | 12,100 | Good |
| State Route 29 over Adobe Creek | 1966 | 12,100 | Good |
| State Route 29 over Hill Creek | 1966 | 12,100 | Good |
| State Route 29 over Manning Creek | 1966 | 12,100 | Good |
| State Route 29 over Putah Creek | 2003 | 10,900 | Good |
| State Route 29 over Lupiyoma Creek | 1955 | 10,900 | Fair |
| State Route 29 over Saint Helena Creek | 1934 | 10,900 | Good |
| State Route 29 over Seigler Creek | 1991 | 10,600 | Fair |
| State Route 20 over Bachelor Creek | 2022 | 10,600 | Good |
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.