Bridge conditions in Codington County, South Dakota
75 inventoried bridges · 14 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 75 Codington County bridges in the federal inventory, 14 carry a poor rating. That 18.7% share is roughly 3x the national average.
- 14 of the 75 bridges in Codington County, South Dakota, are rated in poor condition (18.7%) in the 2025 National Bridge Inventory, as of .
- 15 bridges (20.0%) are rated good and 46 (61.3%) fair.
- The median Codington County bridge was built in 1974.
- The busiest poor-rated bridge is 14TH Ave. N Wtn. over Big Sioux Rv (built 1974), carrying about 4,970 vehicles a day.
Good 20.0% · Fair 61.3% · Poor 18.7% of 75 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 |
|---|---|---|---|
| 14TH Ave. N Wtn. over Big Sioux Rv | 1974 | 4,970 | Poor |
| 31 St NE over Willow Creek | 1990 | 1,904 | Poor |
| Sioux Conifer Road over Big Sioux Rv | 1940 | 1,499 | Poor |
| 455 Avenue over Mahoney Ck | 1940 | 1,167 | Poor |
| 455 Avenue over Ck | 1940 | 672 | Poor |
| 460 Avenue over Willow Ck | 2001 | 472 | Poor |
| 176 Street over Big Sioux Rv | 1971 | 468 | Poor |
| 172 Street over Ck | 1940 | 73 | Poor |
| 177 Street over Big Sioux Rv | 1920 | 73 | Poor |
| 167 Street over Willow Ck | 1910 | 73 | Poor |
| SD020 P over Ck | 1931 | 60 | Poor |
| Oak Street over Willow Ck | 1988 | 60 | Poor |
| 162 Street over Big Sioux Rv | 1985 | 40 | Poor |
| Cottonwood Street over Big Sioux Rv | 1973 | 40 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US212 over Big Sioux Rv | 2019 | 14,592 | Good |
| US212 Ser Rd over Ck | 1970 | 12,968 | Fair |
| US212 over Willow Ck | 1970 | 10,862 | Fair |
| US081 over Big Sioux Rv | 1966 | 7,665 | Fair |
| W Kemp Avenue over Big Sioux River | 1935 | 5,053 | Fair |
| 14TH Ave. N Wtn. over Big Sioux Rv | 1974 | 4,970 | Poor |
| I029 N over 458 Ave | 1972 | 4,595 | Fair |
| I029 S over 458 Ave | 1972 | 4,595 | Fair |
| I029 S over Willow Ck | 1973 | 4,225 | Fair |
| I029 S over US212 | 1970 | 4,225 | 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.