I-15 NB over I-15 over 300 West
Utah County, Utah · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-15 NB over I-15 over 300 West in Utah County, Utah, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2020, making it 5 years old at the 2025 inventory.
- It carries about 179,486 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 101 of the 274 inventoried bridges in Utah County rated good (36.9%); 3 (1.1%) 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 February 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (40.40417, -111.85389)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete stringer or multi-beam girder |
| Length | about 104 ft |
| Location | I-15 over 300 W In Lehi |
| NBI structure number | 1F 884 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 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 Utah County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-15NB (SR-15) over American Fork Creek | 2011 | 209,636 | Fair |
| I-15NB (SR-15) over 100 E. in AMERICAN FORK | 2011 | 209,636 | Good |
| I-15NB (SR-15) over 300 West Street | 2011 | 209,636 | Fair |
| I-15SB (SR-15) over American Fork Creek | 2011 | 209,636 | Good |
| I-15SB (SR-15) over 100 E. in AMERICAN FORK | 2011 | 209,636 | Good |
| I-15 (SR-15) Sbl over 300 West Street | 2011 | 209,636 | Fair |
All bridges nearby: Utah County, UT bridge conditions · every bridge in Utah County · Utah bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.