Shoshone County Bridge Report Card
Shoshone County scores 59 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Shoshone County, Idaho
Shoshone County has 261 bridges in the National Bridge Inventory, with 26 rated poor and 23 rated scour-critical. Its poor-condition share of 10.0% is above the 5.4% statewide average. Poor-condition bridges carry about 8,900 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Shoshone County a Bridge Condition Exposure Score of 59/100 (F). The county has 261 bridges in the National Bridge Inventory, including 26 in poor condition and 23 rated scour-critical. Poor-condition bridges carry about 8,900 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 | 10.0% | 19.9 |
| Poor-condition traffic exposure | 25 | 2.4% of measured traffic | 1.8 |
| Scour-critical bridge share | 20 | 8.8% | 17.6 |
| Average age vs national baseline | 10 | 53 years vs 48 nationally | 2.1 |
| Traffic-data completeness | 5 | 371,585 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 | 10.0% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 8.8% |
| Average Bridge Age | 53 years |
| Poor-Condition Traffic Exposure | 8,900 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Shoshone County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Bunker AVE over S.fk.coeur Dalene River | Poor condition + traffic exposure | Poor | 1,900 | 1971 |
| Stc5752;cda Rvr RD over Coeur Dalene River | Poor condition + traffic exposure | Poor | 960 | 1951 |
| SH 3 over ST Maries River | Poor condition + traffic exposure | Poor | 460 | 1955 |
| Cooper Pass Road over Canyon Creek | Poor condition + traffic exposure | Poor | 220 | 2012 |
| Potlatch Road over Big Creek Trestle | Poor condition + traffic exposure | Poor | 100 | 1912 |
| I 90b over S.fk.cda R;i-90b Arch | Poor condition + traffic exposure | Poor | 2,300 | 1940 |
| Old River Road over Stc 5752;n.fk.cda River | Poor condition + traffic exposure | Poor | 1,200 | 1930 |
| Stc 5711;moon Pass over Big Dick Creek | Poor condition + traffic exposure | Poor | 370 | 1909 |
| Third Street over S.fk.coeur Dalene River | Poor condition + traffic exposure | Poor | 360 | 1978 |
| Pine Drive; Nf 301 over W.fk.st Maries River | Poor condition + traffic exposure | Poor | 130 | 1973 |
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.