Structure BC-39-15.5-ID · Boulder County, CO
Carries Cherryvale Road over Davidson Ditch, 0.9 Mi S Of US HWY 36.
A culvert 23 ft across. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.
| State | Colorado |
| County | Boulder |
| Location | 0.9 Mi S Of US HWY 36 |
| Carries | Cherryvale Road |
| Crosses | Davidson Ditch |
| Coordinates | 39.96374, -105.21289 |
| Material | Aluminum/Wrought Iron/Cast Iron |
| Design | Culvert |
| Total Length | 22.6 ft (6.9 m) |
| Max Span | 16.1 ft (4.9 m) |
| Deck Width | 51.5 ft (15.7 m) |
| Deck Area | 108.3 sq m |
| Main Spans | 1 |
| Year Built | 1986 |
| Avg Daily Traffic | 3,123 (2022) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
| Last Inspection | February 2025 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 4 — Foundations need monitoring |
| Structure Number | BC-39-15.5-ID |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.