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Old Irr SD050 over Ck

Charles Mix County, South Dakota · rated Fair in the 2025 National Bridge Inventory

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

Old Irr SD050 over Ck in Charles Mix County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1940, making it 85 years old at the 2025 inventory.
It carries about 1,329 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 40 of the 103 inventoried bridges in Charles Mix County rated fair (38.8%); 24 (23.3%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition


Structure	Continuous concrete culvert
Length	about 20 ft
Location	1.0 NW of Wagner
NBI structure number	000000012500288
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.

Bridge	Built	Vehicles/day	Condition
SD045 over Drainage Channel	1994	3,934	Good
SD044 over Platte Ck	1964	2,420	Fair
SD044 over Castalia Ck	1963	1,538	Good
Irr US018 over Saint Francis Bay	2023	1,494	Good
Irr SD050 over Trib Choteau Ck	2020	1,329	Good
Irr US018 over Lake Andes Outlet	2005	1,298	Good