Lewis County Bridge Report Card
Lewis County scores 90 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Lewis County, Idaho
Lewis County has 21 bridges in the National Bridge Inventory, with 1 rated poor and 0 rated scour-critical. Its poor-condition share of 4.8% is at or below the 5.4% statewide average. Poor-condition bridges carry about 50 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Lewis County a Bridge Condition Exposure Score of 90/100 (A). The county has 21 bridges in the National Bridge Inventory, including 1 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 50 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 | 4.8% | 9.5 |
| Poor-condition traffic exposure | 25 | 0.1% of measured traffic | 0.1 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 34 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 47,820 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 | 4.8% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 34 years |
| Poor-Condition Traffic Exposure | 50 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Lewis County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Access Rd; Park RD over Lawyers Creek;park Br | Poor condition + traffic exposure | Poor | 50 | 1917 |
| US 12 over Clearwater R.(kamiah Br) | High traffic | Fair | 4,700 | 1998 |
| US 95 over E.fk. Lapwai Creek | High traffic | Fair | 3,600 | 1957 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2019 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2019 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2019 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2019 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2019 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2020 |
| US 95 over Lapwai Creek | High traffic | Good | 3,600 | 2020 |
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.