State St (CR 650) over Rio Grande River
Alamosa County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- State St (CR 650) over Rio Grande River in Alamosa County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1982, making it 43 years old at the 2025 inventory.
- It carries about 1,994 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 9 of the 15 inventoried bridges in Alamosa County rated fair (60.0%); 0 (0.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: superstructure 7 to 9, substructure 6 to 7.
- Its most recent inspection on record is dated March 2025, 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 → (37.47476, -105.86571)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 9 | Excellent condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete single box beam |
| Length | about 367 ft |
| Location | .1 Mi N of 1ST St |
| NBI structure number | ALAMOSA-001 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
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 |
| US 285 Ml over Rock Creek | 1960 | 5,900 | Good |
| 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.