I-15 (SR-15) Nbl over Cottonwood Creek
Washington County, Utah · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-15 (SR-15) Nbl over Cottonwood Creek in Washington 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 1956, making it 69 years old at the 2025 inventory.
- It carries about 30,540 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 143 of the 177 inventoried bridges in Washington County rated fair (80.8%); 1 (0.6%) 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 January 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 → (37.19684, -113.40121)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete frame |
| Length | about 65 ft |
| Location | 3.5 Mi.no.harrisburg Int. |
| NBI structure number | 1D 555 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Utah department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-15 over Washington Main Street | 2023 | 67,000 | Good |
| I-15 over Mall Drive | 2017 | 66,408 | Good |
| I-15 over Mall Drive | 2017 | 66,408 | Good |
| I-15 (SR-15) Nb&sb over Mill Creek | 1964 | 64,174 | Fair |
| I-15 (SR-15) Nbl over SR-212 SPUI.INT.X-Road. | 2003 | 64,174 | Fair |
| I-15 (SR-15) Sbl over SR-212 Spui Int.x-road. | 2003 | 64,174 | Fair |
All bridges nearby: Washington County, UT bridge conditions · every bridge in Washington County · Utah bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.