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County Road over Hump Creek

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

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

County Road over Hump Creek in Corson 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 1974, making it 51 years old at the 2025 inventory.
It carries about 30 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 26 of the 49 inventoried bridges in Corson County rated fair (53.1%); 4 (8.2%) 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	Prestressed concrete tee beam
Length	about 35 ft
Location	3.7W & 6.1S Mcintosh
NBI structure number	000000016290081
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Irr US012 over Claymore Ck	1958	1,378	Poor
Irr US012 over Deep Bank Ck	1965	1,091	Fair
Irr US012 over Br Snake Ck	1965	1,091	Fair
Irr US012 over Snake Ck	1966	1,091	Fair
Irr SD020 over Ck	2000	956	Good
Irr SD063 over Oak Ck	1980	864	Fair