SH 9 Ml over I 70 Ml
Summit County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 9 Ml over I 70 Ml in Summit County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1971, making it 54 years old at the 2025 inventory.
- It carries about 24,000 vehicles a day (traffic count year 2020).
- Its listed owner is the state 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.
- 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 → (39.59253, -106.0961)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 297 ft |
| Location | at Frisco |
| NBI structure number | F-12-T |
| Condition class | Fair |
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 Pedestrian Underpass | 2023 | 22,287 | Good |
| SH 9 Ml over Blue River | 2013 | 21,000 | 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.