Bridge conditions in Harding County, South Dakota
49 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
1 of the 49 bridges the federal inventory lists in Harding County are rated poor; the rest split 25 good and 23 fair.
- 1 of the 49 bridges in Harding County, South Dakota, are rated in poor condition (2.0%) in the 2025 National Bridge Inventory, as of .
- 25 bridges (51.0%) are rated good and 23 (46.9%) fair.
- The median Harding County bridge was built in 1985.
- The busiest poor-rated bridge is Old Hwy 85 over Sheep Ck (built 1936), carrying about 60 vehicles a day.
Good 51.0% · Fair 46.9% · Poor 2.0% of 49 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Old Hwy 85 over Sheep Ck | 1936 | 60 | Poor |
Busiest bridges in the 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 |
| US085 over Sand Ck | 1974 | 1,190 | Fair |
| US085 over Big Nasty Ck | 1960 | 1,075 | Fair |
| US085 over Crooked Ck | 1973 | 1,075 | Fair |
| SD079 over South Fork Grand Rv | 1957 | 364 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of South Dakota: South Dakota bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.