Calaveras County Bridge Report Card
Calaveras County scores 71 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Calaveras County, California
Calaveras County has 108 bridges in the National Bridge Inventory, with 6 rated poor and 6 rated scour-critical. Its poor-condition share of 5.6% is above the 4.9% statewide average. Poor-condition bridges carry about 3,735 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Calaveras County a Bridge Condition Exposure Score of 71/100 (C). The county has 108 bridges in the National Bridge Inventory, including 6 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 3,735 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 | 5.6% | 11.1 |
| Poor-condition traffic exposure | 25 | 1.7% of measured traffic | 1.2 |
| Scour-critical bridge share | 20 | 5.6% | 11.1 |
| Average age vs national baseline | 10 | 61 years vs 48 nationally | 5.1 |
| Traffic-data completeness | 5 | 225,446 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 | 5.6% |
| State Poor-Condition Share | 4.9% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.6% |
| Average Bridge Age | 61 years |
| Poor-Condition Traffic Exposure | 3,735 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Calaveras County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| State Route 26 over Indian Creek | Poor condition + traffic exposure | Poor | 2,500 | 1998 |
| Big Trees Parkway over N Fork Stanislaus River | Poor condition + traffic exposure | Poor | 400 | 1959 |
| Hogan Dam RD over Calaveras River | Poor condition + traffic exposure | Poor | 368 | 1960 |
| Calaveritas RD over Willow Creek | Poor condition + traffic exposure | Poor | 256 | 1925 |
| Calaveritas RD over Calaveritas Creek | Poor condition + traffic exposure | Poor | 203 | 1928 |
| Rolleri Bypass RD over Angels Creek | Poor condition + traffic exposure | Poor | 8 | 1932 |
| Hogan Dam RD over Cosgrove Creek | Scour-critical foundation rating | Fair | 1,089 | 1941 |
| Double Springs RD over Haupt Creek | Scour-critical foundation rating | Fair | 409 | 1917 |
| Sheep Ranch RD over San Antonio Creek | Scour-critical foundation rating | Fair | 216 | 1930 |
| Dogtown RD over Indian Creek | Scour-critical foundation rating | Fair | 65 | 1930 |
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.