Irr US212 over Missouri Rv (oahe Lk)
Potter County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr US212 over Missouri Rv (oahe Lk) in Potter County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1958 and reconstructed in 1980, making it 67 years old at the 2025 inventory.
- It carries about 521 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 15 of the 24 inventoried bridges in Potter County rated fair (62.5%); 0 (0.0%) 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 October 2024, on a 12-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (45.01143, -100.29386)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel through truss |
| Length | about 4,619 ft |
| Location | Dewey - Potter Co. Line |
| NBI structure number | 000000054056158 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Potter County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US083 over Artichoke Ck | 1989 | 1,490 | Fair |
| US083 over Little Cheyenne Ck | 2003 | 985 | Fair |
| US083 over Little Cheyenne Ck | 2003 | 985 | Good |
| US083 over Trib Little Cheyenne Ck | 2003 | 985 | Good |
| US212 over Ck | 2001 | 934 | Fair |
| US212 over Ck | 2001 | 934 | Good |
All bridges nearby: Potter County, SD bridge conditions · every bridge in Potter County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.