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36460 275TH Street over Platte Creek

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

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

36460 275TH Street over Platte Creek in Charles Mix County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2015, making it 10 years old at the 2025 inventory.
It carries about 48 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 39 of the 103 inventoried bridges in Charles Mix County rated good (37.9%); 24 (23.3%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 64 ft
Location	2.4W & 1N of Platte
NBI structure number	000000012206070
Condition class	Good

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
Old Irr SD050 over Ck	1940	1,329	Fair