Structure 54 1359L · San Bernardino County, CA
Carries Interstate 40 over Tenth Ditch, 08-sbd-040-r12.43.
A culvert 23 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 | California |
| County | San Bernardino |
| Location | 08-sbd-040-r12.43 |
| Carries | Interstate 40 |
| Crosses | Tenth Ditch |
| Coordinates | 34.84091, -116.79944 |
| Material | Steel |
| Design | Culvert |
| Total Length | 23.0 ft (7 m) |
| Max Span | 9.5 ft (2.9 m) |
| Deck Area | 77 sq m |
| Main Spans | 2 |
| Year Built | 1968 |
| Avg Daily Traffic | 8,500 (2024) |
| Truck Traffic | 40% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 54 1359L |
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.