SR-121 over Cottonwood Creek
Duchesne County, Utah · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR-121 over Cottonwood Creek in Duchesne 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 1950, making it 75 years old at the 2025 inventory.
- It carries about 6,125 vehicles a day (traffic count year 2017).
- Its listed owner is the state highway agency.
- It is one of 65 of the 89 inventoried bridges in Duchesne County rated fair (73.0%); 6 (6.7%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 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 → (40.31389, -110.01194)
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 46 ft |
| Location | 1.6 Mile No. of Roosevelt |
| NBI structure number | 0D 525 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | July 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 Duchesne County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-40 (SR-40) over Cottonwood Creek | 2011 | 15,115 | Fair |
| US-40 (SR-40) over Dry Gulch Creek | 2001 | 9,291 | Fair |
| US-40 (SR-40) over Duchesne River | 1996 | 7,815 | Fair |
| US-40 (SR-40) over Dry Gulch Canal | 1958 | 7,815 | Fair |
| US-40 (SR-40) over Strawberry River | 1971 | 7,358 | Fair |
| US-40 (SR-40) over Bridgeland-myton Wash | 1954 | 6,810 | Fair |
All bridges nearby: Duchesne County, UT bridge conditions · every bridge in Duchesne County · Utah bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.