I-15NB (SR-15) over 450 North FA#3368
Weber County, Utah · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-15NB (SR-15) over 450 North FA#3368 in Weber County, Utah, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 69,135 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 99 of the 129 inventoried bridges in Weber County rated fair (76.7%); 9 (7.0%) 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 August 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 → (41.26806, -112.02611)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 137 ft |
| Location | At the Slaterville Intchg |
| NBI structure number | 1F 752 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 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 Weber County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-15 SR-97 over Three Gates Trail | 2024 | 140,000 | Good |
| I-15 (SR-15) Nbl over Union Pacific Railroad | 1966 | 138,457 | Fair |
| I-15 (SR-15) Sbl over SR-97 5600 So. Roy | 1966 | 138,457 | Fair |
| I-15 (SR-15) Sbl over UPRR Hill Afb Branch | 1966 | 138,457 | Fair |
| I-15NB (SR-15) over UPRR and UTA TRACKS | 2008 | 120,588 | Fair |
| I-15 SB (SR-15) over UPRR & Uta | 2009 | 120,588 | Good |
All bridges nearby: Weber County, UT bridge conditions · every bridge in Weber County · Utah bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.