Bridge conditions in St. Charles County, Missouri
419 inventoried bridges · 12 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
St. Charles County tracks close to typical: 12 of its 419 inventoried bridges (2.9%) are rated poor, against a national rate of about 7%.
- 12 of the 419 bridges in St. Charles County, Missouri, are rated in poor condition (2.9%) in the 2025 National Bridge Inventory, as of .
- 138 bridges (32.9%) are rated good and 269 (64.2%) fair.
- The median St. Charles County bridge was built in 1999.
- The busiest poor-rated bridge is Is 64 W over Is 70 (built 1971), carrying about 35,428 vehicles a day.
Good 32.9% · Fair 64.2% · Poor 2.9% of 419 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 64 W over Is 70 | 1971 | 35,428 | Poor |
| Rt W S over Is 70 | 1963 | 10,399 | Poor |
| Or 64 E over Peruque CR | 1935 | 2,603 | Poor |
| Dietrich Rd over Trib of Mccoy CR | 1987 | 2,429 | Poor |
| St Paul Rd over Trib of Peruque CR | 1940 | 1,720 | Poor |
| Park Rd C over Br of Dardenne CR | 1942 | 1,000 | Poor |
| Park Rd B over Br of Dardenne CR | 1942 | 1,000 | Poor |
| Josephville Rd over Trib of Cuivre Rvr | 1950 | 977 | Poor |
| Schwede Rd over Trib of Dardenne C | 1988 | 472 | Poor |
| Oberhelman Rd over Trib of Dardenne C | 1986 | 355 | Poor |
| Sneak Rd over Callaway Fk Osage | 1989 | 121 | Poor |
| Howell Rd over Femme Osage CR | 1991 | 59 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 70 E over Sandford CR | 1953 | 122,262 | Fair |
| Is 70 E over Cole CR | 1953 | 109,398 | Fair |
| Is 70 E over Belleau CR | 1955 | 108,528 | Fair |
| Is 70 E over Rt K Co OR70W to OR70E | 1955 | 107,979 | Fair |
| Is 70 E over Gilmore Br | 1950 | 87,827 | Fair |
| Is 70 W over Cst S 5TH St | 1977 | 84,031 | Fair |
| Is 70 E over Dardenne CR | 1953 | 79,535 | Fair |
| Is 70 W over Dardenne CR | 1953 | 79,535 | Fair |
| Is 70 E over Missouri Rvr Cst Main S | 1978 | 73,950 | Fair |
| US 61 S over Spring Br | 1973 | 71,878 | Fair |
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.