Structure O-05-AU · La Plata County, CO
Carries US 550 Ml over Roadway Game Underpass, 3 Mi N. Of Hermosa.
A culvert 21 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 | La Plata |
| Location | 3 Mi N. Of Hermosa |
| Carries | US 550 Ml |
| Crosses | Roadway Game Underpass |
| Coordinates | 37.45655, -107.80445 |
| Material | Steel |
| Design | Culvert |
| Total Length | 20.7 ft (6.3 m) |
| Max Span | 20.7 ft (6.3 m) |
| Deck Width | 108.3 ft (33 m) |
| Deck Area | 207.9 sq m |
| Main Spans | 1 |
| Year Built | 1977 |
| Avg Daily Traffic | 3,200 (2020) |
| Truck Traffic | 6% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 1 |
| Last Inspection | May 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Not applicable |
| Structure Number | O-05-AU |
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.