US 6 Ml over South Platte Ditch
Washington County, Colorado · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 6 Ml over South Platte Ditch in Washington County, Colorado, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1926 and reconstructed in 1942, making it 99 years old at the 2025 inventory.
- It carries about 1,000 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 14 of the 76 inventoried bridges in Washington County rated good (18.4%); 3 (3.9%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (40.43299, -103.37859)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 22 ft |
| Location | 16.2 Mi No of Jct I-76 |
| NBI structure number | C-23-K |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 76 Ml Wbnd over County Road Q | 1964 | 5,500 | Fair |
| I 76 Ml Ebnd over County Road Q | 1964 | 5,500 | Fair |
| US 34 Ml over Camp Creek | 2000 | 3,300 | Good |
| US 34 Ml over Draw | 2006 | 3,100 | Good |
| US 34 Ml over Surveyor Creek | 1935 | 2,900 | Fair |
| US 6 Ml over Prewitt Res Intake Canal | 1941 | 1,100 | Fair |
All bridges nearby: Washington County, CO bridge conditions · every bridge in Washington County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.