Irr US018 over Wounded Knee Ck
Oglala Lakota County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr US018 over Wounded Knee Ck in Oglala Lakota County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2017, making it 8 years old at the 2025 inventory.
- It carries about 1,170 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 20 of the 35 inventoried bridges in Oglala Lakota County rated good (57.1%); 2 (5.7%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (43.04875, -102.31178)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 8 | Very good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 24 ft |
| Location | 4.8 W Jct Sd 391 |
| NBI structure number | 000000057353458 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Oglala Lakota County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr Bia Rte 36 over White Clay Creek | 2001 | 7,551 | Good |
| Irr US018 over Wolf Ck | 2006 | 5,154 | Fair |
| Irr US018 over Ck | 2016 | 3,597 | Good |
| Irr US018 over Ck | 2011 | 3,274 | Good |
| Irr US018 over Cheyenne Ck | 2020 | 3,274 | Good |
| Irr Bia Rte 27 over White River | 1985 | 2,368 | Fair |
All bridges nearby: Oglala Lakota County, SD bridge conditions · every bridge in Oglala Lakota County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.