SD034 over West Fork Vermillion Rv
Miner County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SD034 over West Fork Vermillion Rv in Miner County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1987, making it 38 years old at the 2025 inventory.
- It carries about 2,168 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 19 of the 63 inventoried bridges in Miner County rated good (30.2%); 19 (30.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now good (substructure 6 to 7).
- Its most recent inspection on record is dated July 2023, on a 24-month routine inspection cycle.
- 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 → (44.00821, -97.51443)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 96 ft |
| Location | 6.3 W Jct US 81 |
| NBI structure number | 000000049168130 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| 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 Miner County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD034 over Rock Ck | 1986 | 1,462 | Good |
| SD034 over Ck | 2023 | 970 | Good |
| SD034 over Ck | 2023 | 970 | Good |
| SD025 over West Fork Vermillion Rv | 1953 | 762 | Fair |
| SD025 over Rock Ck | 1976 | 485 | Fair |
| 435 Ave over West Fork Vermillion Rv | 2020 | 336 | Good |
All bridges nearby: Miner County, SD bridge conditions · every bridge in Miner County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.