County Road 31 over St. Vrain Creek
Fair Condition47 years old6,233 vehicles/day
Location
| State | Colorado |
| County | Boulder |
| Location | 0.6 Miles South Of County |
| Carries | County Road 31 |
| Crosses | St. Vrain Creek |
| Coordinates | 40.17729, -105.17814 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 8 (Very Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Tee Beam |
| Total Length | 115.8 ft (35.3 m) |
| Max Span | 53.5 ft (16.3 m) |
| Deck Width | 38.4 ft (11.7 m) |
| Deck Area | 413.0 sq m |
| Main Spans | 2 |
| Year Built | 1979 |
Traffic
| Avg Daily Traffic | 6,233 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 125 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | BC-31-3.9A-SV |