Bridge conditions in Bon Homme County, South Dakota
126 inventoried bridges · 34 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 126 Bon Homme County bridges in the federal inventory, 34 carry a poor rating. That 27.0% share is roughly 4x the national average.
- 34 of the 126 bridges in Bon Homme County, South Dakota, are rated in poor condition (27.0%) in the 2025 National Bridge Inventory, as of .
- 26 bridges (20.6%) are rated good and 66 (52.4%) fair.
- The median Bon Homme County bridge was built in 1965.
- The busiest poor-rated bridge is SD037 over Missouri River (built 1996), carrying about 830 vehicles a day.
Good 20.6% · Fair 52.4% · Poor 27.0% of 126 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 |
|---|---|---|---|
| SD037 over Missouri River | 1996 | 830 | Poor |
| 42520 293RD Street over Creek | 1939 | 138 | Poor |
| 30480 428TH Avenue over Beaver Creek | 1940 | 130 | Poor |
| 29210 412TH Avenue over Emanuel Creek | 1975 | 127 | Poor |
| 40510 308TH Street over Trib. to Choteau Creek | 1935 | 115 | Poor |
| 310TH Street over Trib to Snatch Ck | 1940 | 88 | Poor |
| Stone House Road over Dry Choteau Creek | 1924 | 60 | Poor |
| 40430 308TH Street over Choteau Creek | 1912 | 60 | Poor |
| 30830 405TH Ave over Trib. to Choteau Creek | 1935 | 60 | Poor |
| 31340 405TH Avenue over Coffee Creek | 1977 | 60 | Poor |
| 30710 406TH Avenue over Trib. to Choteau Creek | 1930 | 60 | Poor |
| Jefferson Road over Trib. to Dry Choteau Ck | 1945 | 60 | Poor |
| 29850 407TH Avenue over Trib to Dry Choteau Crk | 1930 | 60 | Poor |
| 41090 296TH Street over Trib. to Emanuel Creek | 1935 | 60 | Poor |
| 41099 308TH Street over Emanuel Creek | 1983 | 60 | Poor |
| 41260 306TH Street over Emanuel Creek | 1970 | 60 | Poor |
| 41280 294TH Street over Emanuel Creek | 1972 | 60 | Poor |
| 305TH Street over Emanuel Creek | 1970 | 60 | Poor |
| 41460 301ST Street over Emanuel Creek | 1930 | 60 | Poor |
| 41470 300TH Street over Emanuel Creek | 1970 | 60 | Poor |
| 29970 415TH Avenue over Trib. to Emanuel Creek | 1930 | 60 | Poor |
| 42030 302ND Street over Snatch Creek | 1983 | 60 | Poor |
| 42090 303RD Street over Snatch Creek | 1910 | 60 | Poor |
| 42090 305TH Street over Snatch Creek | 1950 | 60 | Poor |
| 42480 302ND Street over Beaver Creek | 1925 | 60 | Poor |
| 29600 426TH Avenue over Prairie Creek | 1905 | 60 | Poor |
| 29650 426TH Avenue over Prairie Creek | 1925 | 60 | Poor |
| 30420 426TH Avenue over Beaver Creek | 1930 | 60 | Poor |
| 30370 427TH Avenue over Beaver Creek | 1955 | 60 | Poor |
| 29210 421ST Avenue over Dawson Creek | 1925 | 56 | Poor |
| 40370 311TH Street over Choteau Creak | 1905 | 50 | Poor |
| 29140 408TH Avenue over Trib. to Emanuel Creek | 1930 | 50 | Poor |
| 30660 418TH Avenue over Deadman Creek | 1967 | 25 | Poor |
| 41480 299TH Street over Emanuel Creek | 1905 | 20 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD050 over Drainage Ditch | 1955 | 2,674 | Good |
| SD050 over Snatch Ck | 1956 | 2,649 | Fair |
| SD050 over Charley Ck | 1979 | 2,510 | Good |
| SD050 over West Br Emanuel Ck | 1960 | 2,498 | Fair |
| SD050 over Emanuel Ck | 1960 | 2,498 | Fair |
| SD037 over Unnamed Ck | 2019 | 1,604 | Good |
| SD037 over Ck | 1958 | 1,375 | Fair |
| SD037 over Ck | 1959 | 1,375 | Fair |
| Irr SD050 over Dry Choteau Ck | 1960 | 1,280 | Fair |
| SD052 over Unnamed Ck | 2021 | 876 | 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.