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SD073 over Lake Ck

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

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

SD073 over Lake Ck in Bennett 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 substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1964, making it 61 years old at the 2025 inventory.
It carries about 522 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 10 of the 15 inventoried bridges in Bennett County rated fair (66.7%); 3 (20.0%) 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


Structure	Continuous steel stringer or multi-beam girder
Length	about 145 ft
Location	6.3 S Jct US 18
NBI structure number	000000004197215
Condition class	Fair

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

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
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