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E Main St Fas 6488 over Beaver Ck

Custer County, South Dakota · rated Poor in the 2025 National Bridge Inventory

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

E Main St Fas 6488 over Beaver Ck in Custer County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1971, making it 54 years old at the 2025 inventory.
It carries about 108 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 5 of the 94 inventoried bridges in Custer County rated poor (5.3%); 5 (5.3%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 37 ft
Location	0.4E Buffalo Gap
NBI structure number	000000017379260
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US016 over French Ck	1966	10,052	Fair
US016 over Ck	1966	10,052	Good
US016A over Laughing Water Ck	1964	6,829	Good
SD079 over Battle Ck	1997	6,610	Good
US016 over French Ck	1974	3,709	Fair
US016 over French Ck	1974	3,709	Fair