Structure D-16-DP · Boulder County, CO
Carries US 287 Ml over Lower Boulder Ditch, 3.4 Mi N Of Lafayette.
A culvert 20 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 | 3.4 Mi N Of Lafayette |
| Carries | US 287 Ml |
| Crosses | Lower Boulder Ditch |
| Coordinates | 40.04783, -105.10258 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 20.3 ft (6.2 m) |
| Max Span | 20.3 ft (6.2 m) |
| Deck Width | 192.6 ft (58.7 m) |
| Deck Area | 363.9 sq m |
| Main Spans | 1 |
| Year Built | 1997 |
| Avg Daily Traffic | 26,000 (2020) |
| Truck Traffic | 3% |
| Lanes On Bridge | 4 |
| Last Inspection | January 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | D-16-DP |
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.