Boone County Bridge Report Card
Boone County scores 91 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Boone County, Missouri
Boone County has 335 bridges in the National Bridge Inventory, with 12 rated poor and 0 rated scour-critical. Its poor-condition share of 3.6% is at or below the 8.8% statewide average. Poor-condition bridges carry about 52,385 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Boone County a Bridge Condition Exposure Score of 91/100 (A). The county has 335 bridges in the National Bridge Inventory, including 12 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 52,385 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 | 3.6% | 7.2 |
| Poor-condition traffic exposure | 25 | 2.9% of measured traffic | 2.2 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 41 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 1,815,153 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 | 3.6% |
| State Poor-Condition Share | 8.8% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 41 years |
| Poor-Condition Traffic Exposure | 52,385 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Boone County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Is 70 E over Perche CR | Poor condition + traffic exposure | Poor | 24,644 | 1958 |
| Mo 163 N over Hinkson CR | Poor condition + traffic exposure | Poor | 19,216 | 1968 |
| Or 70 E over Hominy Creek | Poor condition + traffic exposure | Poor | 3,500 | 1925 |
| RT M E over US 63 | Poor condition + traffic exposure | Poor | 2,994 | 1973 |
| Stewart RD over Flat Br CR | Poor condition + traffic exposure | Poor | 700 | 1920 |
| Richland RD over N Fk Grindstone CR | Poor condition + traffic exposure | Poor | 500 | 1970 |
| Or 63 S over Bass Creek | Poor condition + traffic exposure | Poor | 296 | 1925 |
| Rock Quarry RD over Clear CR | Poor condition + traffic exposure | Poor | 250 | 1981 |
| Bearfield RD over Clear CR | Poor condition + traffic exposure | Poor | 100 | 1986 |
| Old Plank RD over Small Str | Poor condition + traffic exposure | Poor | 100 | 1986 |
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.