Bridge conditions in Tuolumne County, California
125 inventoried bridges · 8 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
8 of the 125 bridges the federal inventory lists in Tuolumne County are rated poor; the rest split 45 good and 72 fair.
- 8 of the 125 bridges in Tuolumne County, California, are rated in poor condition (6.4%) in the 2025 National Bridge Inventory, as of .
- 45 bridges (36.0%) are rated good and 72 (57.6%) fair.
- The median Tuolumne County bridge was built in 1968.
- The busiest poor-rated bridge is Mono Way over Sullivan Creek (built 1991), carrying about 25,060 vehicles a day.
Good 36.0% · Fair 57.6% · Poor 6.4% of 125 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 |
|---|---|---|---|
| Mono Way over Sullivan Creek | 1991 | 25,060 | Poor |
| SR 108 over Mono Way | 2004 | 17,450 | Poor |
| State Route 120 over Chinese Creek | 1914 | 2,800 | Poor |
| Parrotts Ferry Rd over New Melones Reservoir | 1978 | 2,500 | Poor |
| Winding Road over Upper Hunter Creek | 1969 | 50 | Poor |
| Winding Road over Stanislaus River | 1926 | 50 | Poor |
| Winding Road over Blue Canyon Creek | 1968 | 50 | Poor |
| Italian Bar Rd over Rose Creek | 1925 | 20 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mono Way over Sullivan Creek | 1991 | 25,060 | Poor |
| SR 108 over Sullivan Crk / Bergel Rd | 2004 | 20,800 | Fair |
| SR 108 over Hess Avenue | 2004 | 20,800 | Fair |
| SR 108 over Peaceful Oak Rd | 2013 | 20,800 | Good |
| SR 108 over Mono Way | 2013 | 20,800 | Fair |
| State Route 49 over Woods Creek | 1941 | 19,900 | Good |
| State Route 49 over Woods Creek | 1951 | 19,900 | Good |
| State Route 108 over SR 49 NB & Woods Creek | 1987 | 17,450 | Good |
| SR 108 over Sera & Sanguinetti Rd | 1987 | 17,450 | Fair |
| SR 108 over Mono Way | 2004 | 17,450 | Poor |
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.