Nez Perce County Bridge Report Card
Nez Perce County scores 72 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Nez Perce County, Idaho
Nez Perce County has 72 bridges in the National Bridge Inventory, with 3 rated poor and 7 rated scour-critical. Its poor-condition share of 4.2% is at or below the 5.4% statewide average. Poor-condition bridges carry about 670 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Nez Perce County a Bridge Condition Exposure Score of 72/100 (C). The county has 72 bridges in the National Bridge Inventory, including 3 in poor condition and 7 rated scour-critical. Poor-condition bridges carry about 670 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% | 8.3 |
| Poor-condition traffic exposure | 25 | 0.3% of measured traffic | 0.2 |
| Scour-critical bridge share | 20 | 9.7% | 19.4 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.1 |
| Traffic-data completeness | 5 | 223,038 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 | 9.7% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 670 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Nez Perce County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Mcintyre Street over Lapwai Creek | Poor condition + traffic exposure | Poor | 180 | 1935 |
| Lenore Grade Road over Clearwater R;lenore Br. | Poor condition + traffic exposure | Poor | 400 | 1935 |
| Highline Arrow RD over Potlatch R(arrow Jct Br) | Poor condition + traffic exposure | Poor | 90 | 1920 |
| US 12 over US 12;snake River | Scour-critical foundation rating | Fair | 21,000 | 1939 |
| US 12 over Clearwater River;bnrr | Scour-critical foundation rating | Fair | 21,000 | 1951 |
| US 95 over Lapwai Creek | Scour-critical foundation rating | Fair | 7,000 | 1964 |
| US 95 over Lapwai Creek | Scour-critical foundation rating | Fair | 7,000 | 1964 |
| Mission Creek Road over Mission Creek | Scour-critical foundation rating | Fair | 180 | 1947 |
| Tom Beall Road over Lapwai Creek | Scour-critical foundation rating | Good | 80 | 1963 |
| Sma7344;bryden Cyn over Snake R;high/southway Br | High traffic | Fair | 22,000 | 1982 |
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.