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Irr Bia Rte 9 over Little White River

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

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

Irr Bia Rte 9 over Little White River in Todd 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 deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 531 vehicles a day (traffic count year 2024).
It is one of 8 of the 27 inventoried bridges in Todd County rated fair (29.6%); 7 (25.9%) 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

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

Bridge	Built	Vehicles/day	Condition
Irr US083 over Antelope Ck	1981	2,544	Fair
Irr Bia Rte 7 over Little White River	1972	1,851	Poor
Main Street over Antelope Ck	1978	1,400	Fair
Irr US018 over Little White Rv	1989	1,340	Fair
Irr US018 over Trib to Oak Ck	2005	1,303	Fair
Irr US018 over White Horse Ck	2016	1,303	Fair