4400 South Street over I-15 (SR-15) NBL and SBL
Weber County, Utah · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 4400 South Street over I-15 (SR-15) NBL and SBL in Weber County, Utah, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1966, making it 59 years old at the 2025 inventory.
- It carries about 9,768 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 9 of the 129 inventoried bridges in Weber County rated poor (7.0%); 9 (7.0%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (41.18333, -112.01333)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete tee beam |
| Length | about 239 ft |
| Location | 4400 SO.ST.in RIVERDALE |
| NBI structure number | 0D 735 |
| Condition class | Poor |
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.