Structure D 383 · Box Elder County, UT
Carries Sr-13 over Chase Slough, Northwest Of Brigham City.
Set by its lowest-rated component: Deck and Superstructure at 5 of 9.
How ratings work22 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a rigid-frame bridge.
| State | Utah |
| County | Box Elder |
| Location | Northwest Of Brigham City |
| Carries | Sr-13 |
| Crosses | Chase Slough |
| Coordinates | 41.53420, -112.05925 |
| Material | Concrete |
| Design | Frame |
| Total Length | 22.3 ft (6.8 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 40.0 ft (12.2 m) |
| Deck Area | 83.0 sq m |
| Main Spans | 1 |
| Year Built | 1935 |
| Avg Daily Traffic | 8,545 (2017) |
| Truck Traffic | 22% |
| Lanes On Bridge | 2 |
| Last Inspection | May 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 0D 383 |
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.