Bridge conditions in Boone County, Missouri
335 inventoried bridges · 12 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 335 bridges in Boone County: 167 rated good, 156 fair, and 12 poor.
- 12 of the 335 bridges in Boone County, Missouri, are rated in poor condition (3.6%) in the 2025 National Bridge Inventory, as of .
- 167 bridges (49.9%) are rated good and 156 (46.6%) fair.
- The median Boone County bridge was built in 1982.
- The busiest poor-rated bridge is Is 70 E over Perche CR (built 1958), carrying about 24,644 vehicles a day.
Good 49.9% · Fair 46.6% · Poor 3.6% of 335 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 70 E over Perche CR | 1958 | 24,644 | Poor |
| Mo 163 N over Hinkson CR | 1968 | 19,216 | Poor |
| Or 70 E over Hominy Creek | 1925 | 3,500 | Poor |
| Rt M E over US 63 | 1973 | 2,994 | Poor |
| Stewart Rd over Flat Br CR | 1920 | 700 | Poor |
| Richland Rd over N Fk Grindstone CR | 1970 | 500 | Poor |
| Or 63 S over Bass Creek | 1925 | 296 | Poor |
| Rock Quarry Rd over Clear CR | 1981 | 250 | Poor |
| Bearfield Rd over Clear CR | 1986 | 100 | Poor |
| Old Plank Rd over Small Str | 1986 | 100 | Poor |
| Park Access Rd over Flat CR | 1950 | 75 | Poor |
| King Rd over Sugar CR | 1925 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 70 E over Lp 70 | 2015 | 63,178 | Good |
| Is 70 E over Hominy CR | 1983 | 53,537 | Good |
| Is 70 E over Grindstone CR | 1949 | 47,500 | Fair |
| Is 70 E over Sugar Br | 1958 | 40,417 | Fair |
| US 63 S over Mo 740 | 1976 | 38,962 | Fair |
| US 63 S over Hominy CR | 2005 | 38,962 | Good |
| US 63C S over Is 70 | 1961 | 34,174 | Fair |
| Is 70 E over Mo 763 Mo 763 | 2016 | 33,625 | Good |
| Is 70 E over Cst Garth Ave | 2016 | 32,469 | Good |
| Is 70 W over Cst Garth Ave | 2016 | 31,987 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Missouri: Missouri bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.