Blaine County Bridge Report Card
Blaine County scores 87 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Blaine County, Idaho
Blaine County has 95 bridges in the National Bridge Inventory, with 4 rated poor and 2 rated scour-critical. Its poor-condition share of 4.2% is at or below the 5.4% statewide average. Poor-condition bridges carry about 170 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Blaine County a Bridge Condition Exposure Score of 87/100 (B). The county has 95 bridges in the National Bridge Inventory, including 4 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 170 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 | 4.2% | 8.4 |
| Poor-condition traffic exposure | 25 | 0.2% of measured traffic | 0.1 |
| Scour-critical bridge share | 20 | 2.1% | 4.2 |
| Average age vs national baseline | 10 | 47 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 106,208 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 | 4.2% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 2.1% |
| Average Bridge Age | 47 years |
| Poor-Condition Traffic Exposure | 170 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Blaine County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Kilpatrick Br. Rd. over Silver Creek | Poor condition + traffic exposure | Poor | 60 | 1978 |
| Pr over North Fork Wood River | Poor condition + traffic exposure | Poor | 50 | 1950 |
| Fdr over North Fork Of Wood River | Poor condition + traffic exposure | Poor | 50 | 1955 |
| Old Highway 93 over Richfield Canal | Poor condition + traffic exposure | Poor | 10 | 1932 |
| SH 75 over Big Wood River | Scour-critical foundation rating | Fair | 1,400 | 1958 |
| SH 75 over Big Wood River | High traffic | Good | 14,500 | 2002 |
| SH 75 over Big Wood River | High traffic | Fair | 14,500 | 2017 |
| SH 75 over Bellevue Canal | High traffic | Fair | 7,000 | 1931 |
| Stc2815;warm Sprng over Big Wood River | High traffic | Fair | 6,300 | 1972 |
| Dollar Road over Trail Creek | High traffic | Good | 5,000 | 1988 |
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.