Bridge conditions in Mellette County, South Dakota
28 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 28 bridges in Mellette County: 9 rated good, 17 fair, and 2 poor.
- 2 of the 28 bridges in Mellette County, South Dakota, are rated in poor condition (7.1%) in the 2025 National Bridge Inventory, as of .
- 9 bridges (32.1%) are rated good and 17 (60.7%) fair.
- The median Mellette County bridge was built in 1980.
- The busiest poor-rated bridge is Pine Creek (unorg) over Pine Ck (built 1992), carrying about 10 vehicles a day.
Good 32.1% · Fair 60.7% · Poor 7.1% of 28 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 |
|---|---|---|---|
| Pine Creek (unorg) over Pine Ck | 1992 | 10 | Poor |
| County Highway #7 over Cottonwood Ck | 1982 | 9 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr Ar US083 over Horse Head Ck | 1966 | 1,525 | Fair |
| Irr Ar US083 over Ck | 1965 | 1,525 | Good |
| US083 over Little White Rv | 2022 | 1,188 | Good |
| US083 over White Rv | 2021 | 1,188 | Good |
| SD044 over Little White Rv | 1973 | 739 | Fair |
| Irr Ar SD044 over Corn Ck | 1980 | 420 | Good |
| SD044 over Oak Ck | 1989 | 379 | Fair |
| SD044 over White Thunder Ck | 1981 | 323 | Fair |
| SD044 over Black Pipe Ck | 1987 | 302 | Fair |
| SD044 over Pine Ck | 1973 | 302 | 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.