US 6 Ml over South Platte R Ovflw
Logan County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 6 Ml over South Platte R Ovflw in Logan County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1957 and reconstructed in 1976, making it 68 years old at the 2025 inventory.
- It carries about 9,900 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 97 of the 182 inventoried bridges in Logan County rated fair (53.3%); 16 (8.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2023, on a 24-month routine inspection cycle.
- 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 → (40.61831, -103.1871)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete tee beam |
| Length | about 430 ft |
| Location | 1.1 Mi East of Jct SH 14 |
| NBI structure number | B-24-D |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Logan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 6 Ml over City Streets UP RR | 1972 | 9,900 | Fair |
| US 6 Ml over Henderson-smith Ditch | 1965 | 9,900 | Fair |
| US 6 Ml over South Platte River | 1957 | 9,900 | Fair |
| US 6 Ml over South Platte R Ovflw | 1957 | 9,900 | Fair |
| I 76 Ml Wbnd over Twenty Two Slough | 1964 | 5,500 | Fair |
| I 76 Ml Ebnd over Twenty Two Slough | 1964 | 5,500 | Poor |
All bridges nearby: Logan County, CO bridge conditions · every bridge in Logan County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.