Structure 50555000010947 · Siskiyou County, CA
Carries No Data Entered over Trail Gulch, Callahan.
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 | California |
| County | Siskiyou |
| Location | Callahan |
| Carries | No Data Entered |
| Crosses | Trail Gulch |
| Coordinates | 41.21615, -122.92050 |
| Material | Aluminum/Wrought Iron/Cast Iron |
| Design | Culvert |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Area | 46.7 sq m |
| Main Spans | 1 |
| Year Built | 2005 |
| Avg Daily Traffic | 50 |
| Lanes On Bridge | 1 |
| Last Inspection | August 2023 |
| Inspection Frequency | Every 24 months |
| Owner | U.S. Forest Service |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 050555000010947 |
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.