County Road 306 over I 70 Ml Clear Creek
Clear Creek County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Road 306 over I 70 Ml Clear Creek in Clear Creek 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 1965, making it 60 years old at the 2025 inventory.
- It carries about 281 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 45 of the 77 inventoried bridges in Clear Creek County rated fair (58.4%); 5 (6.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2023, 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 → (39.753, -105.6616)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 278 ft |
| Location | 3.7 Mi No of Georgetown I |
| NBI structure number | E-14-T |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| 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 Clear Creek County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 70 Ml over Clear Creek | 1989 | 47,000 | Good |
| I 70 Ml over Clear Creek | 1999 | 47,000 | Fair |
| I 70 Ml over County Road 314 | 1999 | 47,000 | Fair |
| Ramp to US 6 Ml over Clear Creek R | 1959 | 41,000 | Poor |
| I 70 Ml over Clear Creek | 1971 | 39,000 | Fair |
| I 70 Ml over Soda Creek Road | 1958 | 39,000 | Fair |
All bridges nearby: Clear Creek County, CO bridge conditions · every bridge in Clear Creek County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.