Irr I029 N over Little Minnesota Rv
Roberts County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr I029 N over Little Minnesota Rv in Roberts County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1982, making it 43 years old at the 2025 inventory.
- It carries about 2,570 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 77 of the 158 inventoried bridges in Roberts County rated fair (48.7%); 40 (25.3%) 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 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 → (45.67042, -96.97976)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 146 ft |
| Location | 0.8 N Sd 10 & I29 Interch |
| NBI structure number | 000000055119183 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Roberts County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr SD010 over Ck | 2019 | 7,072 | Good |
| Irr SD010 over Ck | 1979 | 6,275 | Fair |
| 458TH Avenue over Creek | 1941 | 5,850 | Fair |
| 458TH Avenue over Creek | 1941 | 5,850 | Fair |
| 459TH Avenue over Creek | 1941 | 5,850 | Good |
| Irr I029 over Big Spring Ck | 1978 | 5,340 | Fair |
All bridges nearby: Roberts County, SD bridge conditions · every bridge in Roberts County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.