Bridge conditions in St. Clair County, Missouri
139 inventoried bridges · 27 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
St. Clair County has 27 bridges rated poor out of 139 inventoried, a 19.4% share that puts it well above the national rate of about 7%.
- 27 of the 139 bridges in St. Clair County, Missouri, are rated in poor condition (19.4%) in the 2025 National Bridge Inventory, as of .
- 36 bridges (25.9%) are rated good and 76 (54.7%) fair.
- The median St. Clair County bridge was built in 1976.
- The busiest poor-rated bridge is Mo 13 N over Otter CR (built 1963), carrying about 8,984 vehicles a day.
Good 25.9% · Fair 54.7% · Poor 19.4% of 139 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.
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mo 13 S over Gallinipper CR Br | 1963 | 17,473 | Fair |
| Mo 13 S over Coon CR | 2006 | 14,028 | Fair |
| Mo 13 S over Coon CR | 2006 | 12,790 | Good |
| Mo 13 S over Osage Rvr (truman | 1974 | 11,746 | Fair |
| Mo 13 N over Osage Rvr (truman | 2000 | 9,080 | Fair |
| Mo 13 N over Otter CR | 1963 | 8,984 | Poor |
| Mo 13 S over Otter CR | 1999 | 7,915 | Good |
| Mo 13 N over US 54 | 2006 | 7,409 | Good |
| Mo 13 S over Panther CR | 2004 | 6,942 | Good |
| Mo 13 N over Panther CR | 2010 | 6,604 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in St. Clair County → - all 139, busiest first, each with its own condition record.
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.