Irr SD1806 over La Roche Ck
Stanley County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr SD1806 over La Roche Ck in Stanley County, South Dakota, 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 2007, making it 18 years old at the 2025 inventory.
- It carries about 279 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 18 of the 37 inventoried bridges in Stanley County rated fair (48.6%); 6 (16.2%) 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 → (44.23193, -99.93058)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 24.7 SE Jct US 83 |
| NBI structure number | 000000059617374 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Stanley County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US083 over Bad Rv | 1956 | 6,040 | Fair |
| SD1806 over Ck | 1963 | 1,566 | Fair |
| SD1806 over Ck | 1963 | 1,566 | Fair |
| SD1806 over Draw | 2010 | 1,566 | Good |
| US014 over Frozenman Ck | 2002 | 1,406 | Good |
| US014 over Willow Ck | 1984 | 1,406 | Good |
All bridges nearby: Stanley County, SD bridge conditions · every bridge in Stanley County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.