Structure N480 · McKinley County, NM
Carries IRR BIA RTE N7140 over Defiance West Wash, 19 Mi SW Of Gallup Nm.
A culvert 21 ft across with 2 openings. 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 | New Mexico |
| County | McKinley |
| Location | 19 Mi SW Of Gallup Nm |
| Carries | IRR BIA RTE N7140 |
| Crosses | Defiance West Wash |
| Coordinates | 35.36897, -109.03278 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 20.7 ft (6.3 m) |
| Max Span | 10.2 ft (3.1 m) |
| Deck Width | 42.0 ft (12.8 m) |
| Deck Area | 80.6 sq m |
| Main Spans | 2 |
| Year Built | 1973 |
| Avg Daily Traffic | 178 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
| Last Inspection | March 2023 |
| Inspection Frequency | Every 24 months |
| Owner | Bureau of Indian Affairs |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 00000000000N480 |
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.