Bridge conditions in Hamlin County, South Dakota
61 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 9 bridges in Hamlin County is rated in poor condition: 7 of 61 on the federal inventory, one of the higher shares in South Dakota.
- 7 of the 61 bridges in Hamlin County, South Dakota, are rated in poor condition (11.5%) in the 2025 National Bridge Inventory, as of .
- 26 bridges (42.6%) are rated good and 28 (45.9%) fair.
- The median Hamlin County bridge was built in 1980.
- The busiest poor-rated bridge is 180TH Street over Big Sioux River (built 1930), carrying about 135 vehicles a day.
Good 42.6% · Fair 45.9% · Poor 11.5% of 61 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 |
|---|---|---|---|
| 180TH Street over Big Sioux River | 1930 | 135 | Poor |
| 192ND Street over Hidewood Creek | 1930 | 115 | Poor |
| 460TH Avenue over Lake Poinsett Outlet | 1960 | 66 | Poor |
| 190TH Street over Hidewood Creek | 1965 | 40 | Poor |
| 194TH Street over Dolph Creek | 1960 | 38 | Poor |
| 180TH Street over Trib. to Big Sioux River | 1930 | 25 | Poor |
| 179 Street over Stray Horse Ck | 1910 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I029 S over 462 Ave | 1973 | 4,595 | Fair |
| I029 N over 462 Ave | 1973 | 4,595 | Fair |
| I029 S over Stray Horse Ck | 1973 | 4,595 | Fair |
| I029 N over Stray Horse Ck | 1973 | 4,595 | Fair |
| I029 S over SD022 | 1973 | 4,595 | Fair |
| I029 N over SD022 | 1973 | 4,595 | Fair |
| US081 over Lake Albert Outlet | 1991 | 2,258 | Fair |
| SD028 over Lake Norden Outlet | 1949 | 1,862 | Fair |
| SD028 over Big Sioux Rv | 1951 | 1,371 | Fair |
| SD028 over Trib Dolph Ck | 2021 | 1,240 | 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.