US 285 Ml over Rock Creek
Alamosa County, Colorado · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 285 Ml over Rock Creek in Alamosa 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 1960, making it 65 years old at the 2025 inventory.
- It carries about 5,900 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 6 of the 15 inventoried bridges in Alamosa County rated good (40.0%); 0 (0.0%) 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 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 → (37.43056, -105.89041)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 27 ft |
| Location | 3 Mi S of Alamosa |
| NBI structure number | O-13-I |
| Condition class | Good |
| 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 Alamosa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 160 Ml over Rio Grande | 1966 | 13,000 | Fair |
| State St (CR 650) over Rio Grande River | 1982 | 1,994 | Fair |
| County Road 100 over Empire Canal | 1991 | 1,052 | Fair |
| SH 368 Ml over Alamosa Farm Laterl Cana | 1955 | 230 | Fair |
| SH 368 Ml over Empire Irrigation Canal | 1955 | 230 | Good |
| County Rd. 12 Mile over Empire Canal | 1990 | 132 | Good |
All bridges nearby: Alamosa County, CO bridge conditions · every bridge in Alamosa County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.