Lewis County Bridge Report Card
Lewis County scores 87 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Lewis County, Missouri
Lewis County has 172 bridges in the National Bridge Inventory, with 10 rated poor and 1 rated scour-critical. Its poor-condition share of 5.8% is at or below the 8.8% statewide average. Poor-condition bridges carry about 834 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Lewis County a Bridge Condition Exposure Score of 87/100 (B). The county has 172 bridges in the National Bridge Inventory, including 10 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 834 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 | 5.8% | 11.6 |
| Poor-condition traffic exposure | 25 | 0.5% of measured traffic | 0.4 |
| Scour-critical bridge share | 20 | 0.6% | 1.2 |
| Average age vs national baseline | 10 | 35 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 154,708 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 | 5.8% |
| State Poor-Condition Share | 8.8% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.6% |
| Average Bridge Age | 35 years |
| Poor-Condition Traffic Exposure | 834 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Lewis County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| County RD 552 over Wyaconda Rvr | Poor condition + traffic exposure | Poor | 15 | 1900 |
| Mo 156 E over Troublesome CR | Poor condition + traffic exposure | Poor | 487 | 1973 |
| RT H S over Mid Fabius Rvr | Poor condition + traffic exposure | Poor | 107 | 1961 |
| County RD 429 over Wyaconda Rvr | Poor condition + traffic exposure | Poor | 50 | 1910 |
| County RD 526 over Sugar CR | Poor condition + traffic exposure | Poor | 35 | 1910 |
| County RD 532 over N Fabius Rvr | Poor condition + traffic exposure | Poor | 35 | 1915 |
| County RD 504 over Mid Fabius Rvr | Poor condition + traffic exposure | Poor | 35 | 1920 |
| County RD 597 over Drain Dtch To Miss | Poor condition + traffic exposure | Poor | 30 | 1930 |
| County RD 329 over Mid Fabius Rvr | Poor condition + traffic exposure | Poor | 25 | 1900 |
| County RD 597 over Oyster CR | Poor condition + traffic exposure | Poor | 15 | 1910 |
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.