SD034 over Medicine Knoll Ck
Hughes County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SD034 over Medicine Knoll Ck in Hughes County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1964, making it 61 years old at the 2025 inventory.
- It carries about 1,578 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 15 of the 40 inventoried bridges in Hughes County rated fair (37.5%); 8 (20.0%) 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 2023, 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 → (44.31848, -100.07515)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 284 ft |
| Location | 14.3 E Jct US 14 & 83 |
| NBI structure number | 000000033246153 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 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 Hughes County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US014 over Missouri Rv | 2024 | 15,450 | Good |
| US014 B over Hilgers Gulch | 1969 | 13,755 | Fair |
| Capitol Ave over Capitol Lake Outlet | 1950 | 7,155 | Poor |
| Broadway Ave over Hilgers Gulch | 1964 | 6,045 | Fair |
| Dakota Avenue over Hilgers Gulch | 1995 | 2,315 | Fair |
| US014 over Ck | 1985 | 2,004 | Good |
All bridges nearby: Hughes County, SD bridge conditions · every bridge in Hughes County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.