SH 21 over Crooked Creek
Custer County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 21 over Crooked Creek in Custer County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1968, making it 57 years old at the 2025 inventory.
- It carries about 2,200 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 72 of the 126 inventoried bridges in Custer County rated fair (57.1%); 14 (11.1%) are rated poor.
- 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 → (44.23658, -114.99733)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 20 ft |
| Location | 3.1 W. Stanley |
| NBI structure number | 000000000012965 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Custer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 93 over Garden Creek | 1941 | 2,300 | Fair |
| US 93 over Big Lost River | 1987 | 1,500 | Fair |
| US 93 over Challis Creek | 1991 | 1,400 | Good |
| US 93 over Salmon River;challis Br. | 1995 | 1,400 | Good |
| Capitol Avenue over Swauger Slough | 1940 | 1,220 | Fair |
| SH 75 over Redfish Lake Creek | 1960 | 1,100 | Fair |
All bridges nearby: Custer County, ID bridge conditions · every bridge in Custer County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.