Mo 21 S over Cannon Mine
Washington County, Missouri · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mo 21 S over Cannon Mine in Washington County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1932, making it 93 years old at the 2025 inventory.
- It carries about 5,009 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 91 of the 156 inventoried bridges in Washington County rated fair (58.3%); 17 (10.9%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (38.07567, -90.71464)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 33 ft |
| Location | S 28 T 39 N R 3 E |
| NBI structure number | 5645 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mo 21 S over UP RR | 1993 | 7,409 | Good |
| Mo 21 S over Old Mines CR | 1933 | 7,409 | Fair |
| Mo 8 E over Breton CR | 2002 | 6,972 | Fair |
| Mo 8 E over Br Mill CR | 1968 | 6,462 | Fair |
| Mo 8 E over UP RR | 1968 | 6,462 | Poor |
| Mo 21 S over Old Mines CR | 2006 | 5,370 | Good |
All bridges nearby: Washington County, MO bridge conditions · every bridge in Washington County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.