Arpan Rd over Indian Ck
Butte County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Arpan Rd over Indian Ck in Butte County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1990, making it 35 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 76 of the 142 inventoried bridges in Butte County rated fair (53.5%); 20 (14.1%) 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 August 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 → (44.78467, -103.64854)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 117 ft |
| Location | 5W 7.5N Nisland |
| NBI structure number | 000000010200295 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Butte County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US085 over Hay Ck | 1963 | 15,432 | Fair |
| US085 over Belle Fourche Rv | 1958 | 10,476 | Fair |
| SD034 over Willow Ck | 1939 | 3,961 | Fair |
| SD034 over Redwater Rv | 1992 | 3,547 | Fair |
| SD034 over Redwater Canal | 1964 | 3,547 | Good |
| SD034 over False Bottom Ck | 1992 | 3,547 | Fair |
All bridges nearby: Butte County, SD bridge conditions · every bridge in Butte County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.