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Old Ft Thompson Rd over Soldier Creek

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

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

Old Ft Thompson Rd over Soldier Creek in Buffalo 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1973, making it 52 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2018).
It is one of 16 of the 25 inventoried bridges in Buffalo County rated fair (64.0%); 1 (4.0%) 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 113 ft
Location	1 Mi. So. of Ft. Thompson
NBI structure number	CEPMROSD0000018
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Bia Rte 4 over Campbell Creek	2013	1,720	Good
SD045 over Crow Ck	1960	949	Fair
Irr SD050 over Wolf Ck	1954	928	Fair
Irr SD050 over Crow Ck	1999	928	Good
Irr SD034 over East Fork Soldier Ck	1962	918	Fair
Irr SD047 over Soldier Ck	1963	917	Fair