US 40 Ml over Diamond Creek
Grand County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 40 Ml over Diamond Creek in Grand County, Colorado, 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 2000, making it 25 years old at the 2025 inventory.
- It carries about 2,300 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 46 of the 88 inventoried bridges in Grand County rated fair (52.3%); 5 (5.7%) 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 December 2024, 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 → (40.3165, -106.5209)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 21 ft |
| Location | 5.6 Mi SE of Jct SH 14 |
| NBI structure number | C-10-D |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2024 |
| 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 Grand County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 40 Ml over UP RR | 1985 | 11,000 | Fair |
| US 40 Ml over Fraser River | 1985 | 11,000 | Fair |
| US 40 Ml over Vasquez Creek | 1938 | 11,000 | Fair |
| US 40 Ml over Crooked Creek | 1941 | 11,000 | Poor |
| US 40 Ml over Fraser River | 1942 | 11,000 | Fair |
| US 40 Ml over Pedestrian Underpass | 2004 | 11,000 | Good |
All bridges nearby: Grand County, CO bridge conditions · every bridge in Grand County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.