US-91 (SR-91) Sbl over Union Pacific Railroad
Box Elder County, Utah · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-91 (SR-91) Sbl over Union Pacific Railroad in Box Elder County, Utah, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1967, making it 58 years old at the 2025 inventory.
- It carries about 22,593 vehicles a day (traffic count year 2017).
- Its listed owner is the state highway agency.
- It is one of 131 of the 184 inventoried bridges in Box Elder County rated fair (71.2%); 11 (6.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (41.48632, -112.04322)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 175 ft |
| Location | 11TH So Brigham City |
| NBI structure number | 3C 451 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Utah department of transportation.
Busiest bridges in Box Elder County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-15 (SR-15) SB over 13600 North St. | 1989 | 195,867 | Good |
| I-15 (SR-15) Nbl over Hot Springs Lane and U | 1976 | 67,875 | Fair |
| I-15 (SR-15) Nbl over Nerva Lane (county Road) | 1976 | 67,875 | Fair |
| I-15 (SR-15) Nbl over SR-315 to Willard Bay | 1976 | 67,875 | Fair |
| I-15 (SR-15) Sbl over Hot Springs Ln.& Abd | 1976 | 67,875 | Fair |
| I-15 (SR-15) Sbl over Nerva Lane (county Road) | 1976 | 67,875 | Fair |
All bridges nearby: Box Elder County, UT bridge conditions · every bridge in Box Elder County · Utah bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.