Adams County Bridge Report Card
Adams County scores 73 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Adams County, Idaho
Adams County has 87 bridges in the National Bridge Inventory, with 8 rated poor and 3 rated scour-critical. Its poor-condition share of 9.2% is above the 5.4% statewide average. Poor-condition bridges carry about 345 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Adams County a Bridge Condition Exposure Score of 73/100 (C). The county has 87 bridges in the National Bridge Inventory, including 8 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 345 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 | 9.2% | 18.4 |
| Poor-condition traffic exposure | 25 | 0.8% of measured traffic | 0.6 |
| Scour-critical bridge share | 20 | 3.4% | 6.9 |
| Average age vs national baseline | 10 | 50 years vs 48 nationally | 0.8 |
| Traffic-data completeness | 5 | 41,653 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 | 9.2% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.4% |
| Average Bridge Age | 50 years |
| Poor-Condition Traffic Exposure | 345 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Adams County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Old Hornet Road over Hornet Creek | Poor condition + traffic exposure | Poor | 100 | 1949 |
| Wildhorse Road over Wildhorse River | Poor condition + traffic exposure | Poor | 30 | 1908 |
| Middle Fork Road over M.fk.weiser River | Poor condition + traffic exposure | Poor | 70 | 1957 |
| No Data Entered over Boulder Creek | Poor condition + traffic exposure | Poor | 50 | 1957 |
| Jackson Creek RD over Weiser River | Poor condition + traffic exposure | Poor | 50 | 1988 |
| Old HWY 95 over Little Salmon River | Poor condition + traffic exposure | Poor | 20 | 1923 |
| Airport RD over Weiser River | Poor condition + traffic exposure | Poor | 20 | 1982 |
| Cemetary RD over Bear Creek | Poor condition + traffic exposure | Poor | 5 | 1983 |
| US 95 over Little Salmon River | Scour-critical foundation rating | Fair | 2,600 | 1962 |
| US 95 over W.fk.goose Creek | High traffic | Fair | 3,300 | 1978 |
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.