Structure 18011 · Custer County, ID
Carries US 93 over Warm Spring Creek, 6.8 S. Challis.
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 | Idaho |
| County | Custer |
| Location | 6.8 S. Challis |
| Carries | US 93 |
| Crosses | Warm Spring Creek |
| Coordinates | 44.44814, -114.14397 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 23.0 ft (7 m) |
| Max Span | 23.0 ft (7 m) |
| Deck Width | 38.1 ft (11.6 m) |
| Deck Area | 81.2 sq m |
| Main Spans | 1 |
| Year Built | 2018 |
| Avg Daily Traffic | 810 (2023) |
| Truck Traffic | 17% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 000000000018011 |
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.