STC6803;S Ylwstone over Salem Union Canal
Fremont County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- STC6803;S Ylwstone over Salem Union Canal in Fremont County, Idaho, 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 2002, making it 23 years old at the 2025 inventory.
- It carries about 1,600 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 85 of the 138 inventoried bridges in Fremont County rated fair (61.6%); 8 (5.8%) 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 April 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 → (43.95414, -111.68756)
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 22 ft |
| Location | 6.5 N Sugar City |
| NBI structure number | 000000000032216 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Fremont County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 Ebl & Wbl over Salem Union Canal | 1984 | 12,500 | Fair |
| US 20 over 2290 E | 1984 | 12,500 | Fair |
| US 20B over Henrys Fk. Snake River | 1965 | 11,500 | Fair |
| US 20B over Egin Canal | 1975 | 11,500 | Good |
| US 20 Wbl & Ebl over S.fk.fall River Canal | 1973 | 10,500 | Fair |
| US 20 Ebl & Wbl over Salem Union Canal | 1979 | 9,100 | Fair |
All bridges nearby: Fremont County, ID bridge conditions · every bridge in Fremont County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.