Clark County Bridge Report Card
Clark County scores 70 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Clark County, Idaho
Clark County has 39 bridges in the National Bridge Inventory, with 5 rated poor and 0 rated scour-critical. Its poor-condition share of 12.8% is above the 5.4% statewide average. Poor-condition bridges carry about 2,100 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Clark County a Bridge Condition Exposure Score of 70/100 (C). The county has 39 bridges in the National Bridge Inventory, including 5 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 2,100 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 | 12.8% | 25.6 |
| Poor-condition traffic exposure | 25 | 5.5% of measured traffic | 4.2 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 47 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 37,903 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 | 12.8% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 47 years |
| Poor-Condition Traffic Exposure | 2,100 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Clark County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| I 15 Sbl over Co.rd.;stoddard Creek Ic | Poor condition + traffic exposure | Poor | 1,750 | 1969 |
| Stc 6760;red Road over Camas Creek | Poor condition + traffic exposure | Poor | 200 | 1953 |
| Old HWY 91 over Uprr;n.spencer Rr Op | Poor condition + traffic exposure | Poor | 50 | 1936 |
| Diversion Road over Camas Creek | Poor condition + traffic exposure | Poor | 50 | 1953 |
| Vadnais Lane over Camas Creek | Poor condition + traffic exposure | Poor | 50 | 1981 |
| I 15 over Frontage Road | High traffic | Fair | 3,700 | 1965 |
| I 15 over Beaver Creek | High traffic | Fair | 3,500 | 1969 |
| I 15 over Frontage Road Gs | High traffic | Fair | 3,500 | 1969 |
| I 15 over Beaver Creek | High traffic | Fair | 3,400 | 1963 |
| I 15 Nbl & Sbl over Beaver Creek;s.dubois Br | High traffic | Fair | 3,400 | 1965 |
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.