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Stc 5756;BIG CR Rd over Big Creek;sunshine Mine

Shoshone County, Idaho · rated Fair in the 2025 National Bridge Inventory

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

Stc 5756;BIG CR Rd over Big Creek;sunshine Mine in Shoshone County, Idaho, 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 1974, making it 51 years old at the 2025 inventory.
It carries about 60 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 174 of the 261 inventoried bridges in Shoshone County rated fair (66.7%); 26 (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 multiple box beam
Length	about 82 ft
Location	6.1 E. Kellogg
NBI structure number	000000000020555
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I 90 over Stc 5766;SILVERTON Ic	1978	11,000	Fair
I 90 EB & WB over S.fk.cda R;fr.rd.	1978	11,000	Fair
I 90 over S.fk.coeur Dalene River	1987	11,000	Fair
I 90 Ebl & Wbl over Crossroad Bd;w.wallace I	1987	11,000	Fair
I 90 over I 90B;CANYON CR	1991	11,000	Fair
I 90 Spur over Canyon Creek	1940	10,500	Fair