US 550 Ml over Cascade Creek
San Juan County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 550 Ml over Cascade Creek in San Juan 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 1949, making it 76 years old at the 2025 inventory.
- It carries about 1,900 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 7 of the 12 inventoried bridges in San Juan County rated fair (58.3%); 1 (8.3%) are rated poor.
- 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 → (37.65919, -107.81127)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 29 ft |
| Location | 30 Mi No of Jct US 160 |
| NBI structure number | N-05-D |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in San Juan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 550 Ml over Mineral Creek | 2011 | 1,900 | Good |
| County Road 2 over Cunningham Creek | 1989 | 997 | Fair |
| County Road 2 over Animas River | 1988 | 920 | Fair |
| Greene Street over Cement Creek | 1929 | 647 | Poor |
| 14TH Street over Cement Creek | 1993 | 647 | Fair |
| 14TH Street over Animas River | 1992 | 265 | Fair |
All bridges nearby: San Juan County, CO bridge conditions · every bridge in San Juan County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.