Bridge conditions in Roberts County, South Dakota
158 inventoried bridges · 40 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 158 Roberts County bridges in the federal inventory, 40 carry a poor rating. That 25.3% share is roughly 4x the national average.
- 40 of the 158 bridges in Roberts County, South Dakota, are rated in poor condition (25.3%) in the 2025 National Bridge Inventory, as of .
- 41 bridges (25.9%) are rated good and 77 (48.7%) fair.
- The median Roberts County bridge was built in 1977.
- The busiest poor-rated bridge is Irr SD127 over Little Minnesota Rv (built 1953), carrying about 872 vehicles a day.
Good 25.9% · Fair 48.7% · Poor 25.3% of 158 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 |
|---|---|---|---|
| Irr SD127 over Little Minnesota Rv | 1953 | 872 | Poor |
| Irr SD127 over Big Slough Ck | 1955 | 354 | Poor |
| 105 St over Bois De Sioux R | 1930 | 200 | Poor |
| 101ST Street over Creek | 1929 | 144 | Poor |
| 118TH Street over Little Minnesota River | 1939 | 68 | Poor |
| 141ST Street over Creek | 1969 | 68 | Poor |
| 468TH Avenue over Creek | 1901 | 50 | Poor |
| 471ST Avenue over Creek | 1934 | 50 | Poor |
| 466TH Avenue over Creek | 1940 | 38 | Poor |
| 141ST Street over N. Fork Whetstone Rv | 1935 | 38 | Poor |
| 450TH Avenue over Little Minnesota River | 1950 | 35 | Poor |
| 104TH Street over Little Minnesota River | 1967 | 35 | Poor |
| 112TH Street over Little Minnesota River | 1974 | 35 | Poor |
| 466TH Avenue over Creek | 1935 | 35 | Poor |
| 138TH Street over N. Fork Whetstone Rv | 1965 | 35 | Poor |
| 466TH Avenue over Creek | 1940 | 32 | Poor |
| 465TH Avenue over Creek | 1945 | 31 | Poor |
| 465TH Avenue over Creek | 1945 | 31 | Poor |
| 107TH Street over Little Minnesota River | 1950 | 30 | Poor |
| 463RD Avenue over Creek | 1929 | 30 | Poor |
| 463RD Avenue over Creek | 1966 | 30 | Poor |
| 134TH Street over N. Fork Whetstone Rv | 1960 | 30 | Poor |
| 117TH Street over Jim Creek | 1929 | 30 | Poor |
| 474TH Avenue over Big Slough Creek | 1960 | 30 | Poor |
| 451ST Avenue over Creek | 1940 | 29 | Poor |
| 468TH Avenue over N. Fork Whetstone Rv | 1940 | 28 | Poor |
| 454TH Avenue over Creek | 1950 | 25 | Poor |
| 105TH Street over Little Minnesota River | 1967 | 25 | Poor |
| 475TH Avenue over N. Fork Whetstone Rv | 1967 | 25 | Poor |
| 477TH Avenue over Creek | 1966 | 25 | Poor |
| 460TH Avenue over Big Coulee Creek | 1950 | 22 | Poor |
| 476TH Avenue over Big Slough Creek | 1930 | 22 | Poor |
| 477TH Avenue over Big Slough Creek | 1955 | 22 | Poor |
| 117TH Street over Creek | 1965 | 20 | Poor |
| 464TH Avenue over N. Fork Whetstone Rv | 1929 | 20 | Poor |
| 464TH Avenue over Creek | 1950 | 20 | Poor |
| 468TH Avenue over Creek | 1967 | 20 | Poor |
| 469TH Avenue over Creek | 1935 | 17 | Poor |
| 138TH Street over Creek | 1938 | 10 | Poor |
| 139TH Street over Creek | 1968 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr SD010 over Ck | 2019 | 7,072 | Good |
| Irr SD010 over Ck | 1979 | 6,275 | Fair |
| 458TH Avenue over Creek | 1941 | 5,850 | Fair |
| 458TH Avenue over Creek | 1941 | 5,850 | Fair |
| 459TH Avenue over Creek | 1941 | 5,850 | Good |
| Irr I029 over Big Spring Ck | 1978 | 5,340 | Fair |
| Irr I029 over Ck | 1978 | 5,340 | Fair |
| Irr I029 over Twin City RR | 1982 | 4,890 | Fair |
| Irr I029 over Hines Ck | 1978 | 4,890 | Fair |
| Irr I029 S over Burlington Northern RR | 1979 | 3,650 | 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.