SD020 over Brush Ck
Harding County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SD020 over Brush Ck in Harding 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 1975, making it 50 years old at the 2025 inventory.
- It carries about 112 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 23 of the 49 inventoried bridges in Harding County rated fair (46.9%); 1 (2.0%) 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 March 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 → (45.58166, -103.61711)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 145 ft |
| Location | 3.5 W of Buffalo |
| NBI structure number | 000000032215255 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 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 Harding County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US085 over South Fork Grand Rv | 1963 | 1,484 | Fair |
| US085 over Buffalo Ck | 1964 | 1,330 | Fair |
| US085 over Sheep Ck | 1963 | 1,248 | Fair |
| US085 over Jones Ck | 1960 | 1,248 | Fair |
| US085 over Bull Ck | 1960 | 1,248 | Fair |
| US085 over North Br Moreau Rv | 1974 | 1,190 | Fair |
All bridges nearby: Harding County, SD bridge conditions · every bridge in Harding County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.