Dart Rd over Old Mines CR
Washington County, Missouri · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Dart Rd over Old Mines CR in Washington County, Missouri, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1950, making it 75 years old at the 2025 inventory.
- It carries about 20 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 17 of the 156 inventoried bridges in Washington County rated poor (10.9%); 17 (10.9%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (38.05306, -90.75861)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 4 | Poor condition |
| Substructure | 3 | Serious condition |
Bridge details
| Structure | Concrete slab |
| Length | about 37 ft |
| Location | S 3309 T 38 N R 2 E |
| NBI structure number | 36270 |
| Condition class | Poor |
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.