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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 August 20, 2026

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 August 20, 2026.
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.

Every bridge in Bon Homme County → - all 126, busiest first, each with its own condition record.

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.