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Bridge conditions in Bennett County, South Dakota

15 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Of the 15 Bennett County bridges in the federal inventory, 3 carry a poor rating. That 20.0% share is roughly 3x the national average.

3 of the 15 bridges in Bennett County, South Dakota, are rated in poor condition (20.0%) in the 2025 National Bridge Inventory, as of August 20, 2026.
2 bridges (13.3%) are rated good and 10 (66.7%) fair.
The median Bennett County bridge was built in 1954.
The busiest poor-rated bridge is 220 Avenue over Lake Ck (built 1950), carrying about 40 vehicles a day.

Good 13.3% · Fair 66.7% · Poor 20.0% of 15 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
220 Avenue over Lake Ck	1950	40	Poor
205 Avenue over Ck	1932	37	Poor
295 Street over Ck	1932	27	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US018 over Ck	1951	906	Fair
US018 over Trib Little White Rv	2020	573	Good
SD073 over Little White Rv	1964	522	Fair
SD073 over Lake Ck	1964	522	Fair
Irr Bia Rte Allen over Trib of White River	2017	300	Good
290 Street over Ck	1954	123	Fair
231 Avenue over Ck	1954	123	Fair
231 Avenue over Lake Ck	1954	120	Fair
231 Avenue over Little White Rv	1976	119	Fair
220 Avenue over Lake Ck	1950	40	Poor

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.