Bridge conditions in Todd County, South Dakota
27 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Todd County has 7 bridges rated poor out of 27 inventoried, a 25.9% share that puts it well above the national rate of about 7%.
- 7 of the 27 bridges in Todd County, South Dakota, are rated in poor condition (25.9%) in the 2025 National Bridge Inventory, as of .
- 12 bridges (44.4%) are rated good and 8 (29.6%) fair.
- The median Todd County bridge was built in 1994.
- The busiest poor-rated bridge is Irr Bia Rte 7 over Little White River (built 1972), carrying about 1,851 vehicles a day.
Good 44.4% · Fair 29.6% · Poor 25.9% of 27 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 Bia Rte 7 over Little White River | 1972 | 1,851 | Poor |
| Irr Bia Rte 5 over Little White River | 1967 | 1,050 | Poor |
| Irr Bia Rte 5 over Little White River | 1967 | 1,050 | Poor |
| Irr Bia Rte 5 over Little White River | 1965 | 1,019 | Poor |
| Hidden Timber Road over Antelope Ck | 1951 | 128 | Poor |
| Irr Bia Rte 11 over Rosebud Creek | 1971 | 114 | Poor |
| Irr Bia Rte 3 over Little White River | 1964 | 44 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr US083 over Antelope Ck | 1981 | 2,544 | Fair |
| Irr Bia Rte 7 over Little White River | 1972 | 1,851 | Poor |
| Main Street over Antelope Ck | 1978 | 1,400 | Fair |
| Irr US018 over Little White Rv | 1989 | 1,340 | Fair |
| Irr US018 over Trib to Oak Ck | 2005 | 1,303 | Fair |
| Irr US018 over White Horse Ck | 2016 | 1,303 | Fair |
| Irr Bia Rte 5 over Little White River | 2016 | 1,096 | Good |
| Irr Bia Rte 5 over Little White River | 1967 | 1,050 | Poor |
| Irr Bia Rte 5 over Little White River | 1967 | 1,050 | Poor |
| Tpp Bia Rte 5 over Little White River | 2024 | 1,050 | 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.