Swan Mountain Rd over Blue River
Summit County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Swan Mountain Rd over Blue River in Summit County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1993, making it 32 years old at the 2025 inventory.
- It carries about 3,594 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 42 of the 63 inventoried bridges in Summit County rated fair (66.7%); 5 (7.9%) 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: culvert 6 to 5.
- Its most recent inspection on record is dated September 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 → (39.56666, -106.04954)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 5 | Fair condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 45 ft |
| Location | 0.2 Mile East of Highway |
| NBI structure number | 117000100.2004A |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 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 Summit County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 70 Wbnd over Forest Service Road | 2021 | 36,000 | Good |
| I 70 Ebnd over Forest Service Road | 2021 | 36,000 | Good |
| I 70 Ml over County Road | 1977 | 27,000 | Good |
| SH 9 Ml over Tenmile Creek | 1980 | 24,000 | Fair |
| SH 9 Ml over I 70 Ml | 1971 | 24,000 | Fair |
| SH 9 Ml over Pedestrian Underpass | 2023 | 22,287 | Good |
All bridges nearby: Summit County, CO bridge conditions · every bridge in Summit County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.