US018 over Ck

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

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

US018 over 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 culvert, rated 5 (fair condition) on the 0-9 scale.
It was built in 1951, making it 74 years old at the 2025 inventory.
It carries about 906 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.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
Its condition class and component ratings are unchanged from the 2024 inventory.
Its most recent inspection on record is dated September 2023, on a 24-month routine inspection cycle.
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 (2024)	Rating (2025)	FHWA scale meaning
Culvert	5	5	Fair condition


Structure	Continuous concrete culvert
Length	about 37 ft
Location	3.8 E Oglala Lakota Co Ln
NBI structure number	000000004037172
Condition class	Fair
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	September 2023
Inspection interval (item 91)	24 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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

Bridge	Built	Vehicles/day	Condition
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