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Irr Bia Rte 6 over Red Coat Creek

Ziebach 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 6 over Red Coat Creek in Ziebach 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 1976 and reconstructed in 2005, making it 49 years old at the 2025 inventory.
It carries about 275 vehicles a day (traffic count year 2023).
It is one of 20 of the 30 inventoried bridges in Ziebach County rated fair (66.7%); 3 (10.0%) 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	Prestressed concrete tee beam
Length	about 87 ft
Location	1.9 Km SE of Red Scaffold
NBI structure number	00000000000A101
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 US212 over Ck	1954	1,291	Fair
Irr US212 over Bear Ck	1954	1,130	Fair
Irr US212 over Bear Ck	1955	1,083	Fair
Irr Bia Rte 6 over Ash Creek	1968	814	Good
Irr SD063 over Rudy Ck Tributary	1994	590	Fair
Irr SD063 over Rudey Ck	1993	590	Fair