Bridge conditions in Alpine County, California
33 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 33 bridges in Alpine County: 10 rated good, 21 fair, and 2 poor.
- 2 of the 33 bridges in Alpine County, California, are rated in poor condition (6.1%) in the 2025 National Bridge Inventory, as of .
- 10 bridges (30.3%) are rated good and 21 (63.6%) fair.
- The median Alpine County bridge was built in 1963.
- The busiest poor-rated bridge is State Route 4 over Silver Creek (built 1952), carrying about 540 vehicles a day.
Good 30.3% · Fair 63.6% · Poor 6.1% of 33 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 |
|---|---|---|---|
| State Route 4 over Silver Creek | 1952 | 540 | Poor |
| Crystal Sprgs Camp over West Fork Carson River | 1938 | 275 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 88 over West Fork Carson River | 1952 | 3,225 | Fair |
| Old State Route 88 over West Fork Carson River | 1939 | 3,200 | Fair |
| State Route 89 over West Fork Carson River | 1960 | 3,200 | Fair |
| State Route 88 over West Fork Carson River | 1963 | 3,200 | Good |
| State Route 88 over West Fork Carson River | 1963 | 3,200 | Good |
| State Route 89 over Wildlife Access | 1980 | 3,050 | Good |
| State Route 88 over Caples Lake Spillway | 1987 | 2,800 | Fair |
| State Route 88 over West Fork Carson River | 1939 | 2,200 | Fair |
| State Route 89 over West Fork Carson River | 1940 | 2,150 | Fair |
| State Route 4 over Jackass Gulch | 1982 | 1,250 | 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.