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Fs Route No. 400 over Flat Creek

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

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

Fs Route No. 400 over Flat Creek in Shoshone County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1976, making it 49 years old at the 2025 inventory.
It carries about 40 vehicles a day (traffic count year 2018).
It is one of 61 of the 261 inventoried bridges in Shoshone County rated good (23.4%); 26 (10.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 64 ft
Location	19.1 Mi From Babins Jct.
NBI structure number	010401000000063
Condition class	Good

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