US 550 Ml over Gulch A
La Plata County, Colorado · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 550 Ml over Gulch A in La Plata County, Colorado, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2023, making it 2 years old at the 2025 inventory.
- It carries about 7,800 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 45 of the 105 inventoried bridges in La Plata County rated good (42.9%); 1 (1.0%) 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 → (37.22087, -107.84444)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 565 ft |
| Location | 0.4 Mi S of US160 |
| NBI structure number | P-05-AZ |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in La Plata County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 160 Ml over City St_animas Rvr | 1979 | 35,000 | Fair |
| US 160 Ml over Animas River | 1974 | 30,000 | Fair |
| US 550 Ml over Animas River | 1910 | 28,000 | Fair |
| US 160 Ml over Lightner Creek | 1970 | 19,000 | Fair |
| Private Land Acces over Lightner Creek Ar | 1973 | 19,000 | Fair |
| US 160 Ml over Animas River | 1968 | 17,000 | Fair |
All bridges nearby: La Plata County, CO bridge conditions · every bridge in La Plata County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.