Shannon County Bridge Report Card
Shannon County scores 67 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Shannon County, Missouri
Shannon County has 64 bridges in the National Bridge Inventory, with 7 rated poor and 0 rated scour-critical. Its poor-condition share of 10.9% is above the 8.8% statewide average. Poor-condition bridges carry about 3,997 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Shannon County a Bridge Condition Exposure Score of 67/100 (D). The county has 64 bridges in the National Bridge Inventory, including 7 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 3,997 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 | 10.9% | 21.9 |
| Poor-condition traffic exposure | 25 | 7.0% of measured traffic | 5.3 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 63 years vs 48 nationally | 6.2 |
| Traffic-data completeness | 5 | 57,013 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 | 10.9% |
| State Poor-Condition Share | 8.8% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 63 years |
| Poor-Condition Traffic Exposure | 3,997 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Shannon County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| RT Jj S over Castro Valley | Poor condition + traffic exposure | Poor | 929 | 1959 |
| Mo 106 E over Spring Valley CR | Poor condition + traffic exposure | Poor | 871 | 1941 |
| Mo 19 S over Hurricane CR | Poor condition + traffic exposure | Poor | 687 | 1937 |
| Mo 19 S over Rnd Sprgcav RD Prk Sp | Poor condition + traffic exposure | Poor | 597 | 1930 |
| Mo 106 E over Jacks Fork | Poor condition + traffic exposure | Poor | 452 | 1940 |
| Mo 99 S over Spring CR | Poor condition + traffic exposure | Poor | 451 | 1934 |
| County RD 568 over Pike CR | Poor condition + traffic exposure | Poor | 10 | 1950 |
| US 60 E over Birch CR | High traffic | Fair | 6,107 | 1967 |
| US 60 E over Hurricane CR | High traffic | Fair | 5,568 | 1967 |
| US 60 E over Seamam CR | High traffic | Fair | 4,202 | 1967 |
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.