Bridge conditions in Buffalo County, South Dakota
25 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Buffalo County tracks close to typical: 1 of its 25 inventoried bridges (4.0%) are rated poor, against a national rate of about 7%.
- 1 of the 25 bridges in Buffalo County, South Dakota, are rated in poor condition (4.0%) in the 2025 National Bridge Inventory, as of .
- 8 bridges (32.0%) are rated good and 16 (64.0%) fair.
- The median Buffalo County bridge was built in 1975.
- The busiest poor-rated bridge is 355TH Avenue over Crow Creek (built 1975), carrying about 55 vehicles a day.
Good 32.0% · Fair 64.0% · Poor 4.0% of 25 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 |
|---|---|---|---|
| 355TH Avenue over Crow Creek | 1975 | 55 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Bia Rte 4 over Campbell Creek | 2013 | 1,720 | Good |
| SD045 over Crow Ck | 1960 | 949 | Fair |
| Irr SD050 over Wolf Ck | 1954 | 928 | Fair |
| Irr SD050 over Crow Ck | 1999 | 928 | Good |
| Irr SD034 over East Fork Soldier Ck | 1962 | 918 | Fair |
| Irr SD047 over Soldier Ck | 1963 | 917 | Fair |
| SD045 over Crow Ck | 1958 | 755 | Fair |
| SD045 over Ck | 1960 | 755 | Fair |
| State Highway 47 over Big Bend Dam Spillway | 1963 | 676 | Fair |
| Irr SD034 over Campbell Ck | 2016 | 571 | Good |
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.