Bridge conditions in Brule County, South Dakota

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

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

Brule County tracks close to typical: 3 of its 38 inventoried bridges (7.9%) are rated poor, against a national rate of about 7%.

3 of the 38 bridges in Brule County, South Dakota, are rated in poor condition (7.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
12 bridges (31.6%) are rated good and 23 (60.5%) fair.
The median Brule County bridge was built in 1964.
The busiest poor-rated bridge is SD050 over R&w RR (built 1952), carrying about 4,431 vehicles a day.

Good 31.6% · Fair 60.5% · Poor 7.9% of 38 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
SD050 over R&w RR	1952	4,431	Poor
365 Avenue over Smith Ck	1956	15	Poor
365 Ave Fas 6115 over Br Smith Ck	1956	15	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I090 over Ck	1964	7,670	Good
I090 over Mo. Rv (francis Case Lk)	1974	7,260	Fair
I090 over Main St R&w RR	1974	7,260	Good
I090 W over 356 Ave	1964	5,059	Good
I090 E over 356 Ave	1964	5,059	Good
I090 W over 251 St	2006	5,059	Good
I090 E over 251 St	2007	5,059	Good
I090 W over SD045	1963	5,034	Fair
I090 E over SD045	1963	5,034	Fair
SD050 over R&w RR	1952	4,431	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.