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US 93 over Salmon River;carmen Br.

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

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

US 93 over Salmon River;carmen Br. in Lemhi County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 2,100 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 40 of the 114 inventoried bridges in Lemhi County rated fair (35.1%); 9 (7.9%) 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 283 ft
Location	4.5 N. Salmon
NBI structure number	000000000017890
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 93 over Salmon River;salmon Br.	1926	7,300	Poor
US 93 over Carmen Creek	1931	2,100	Fair
US 93 over Tower Creek	1931	2,100	Fair
SH 28 over Lemhi River	2001	1,700	Good
SH 28 over Lemhi River	2001	1,700	Good
SH 28 over Lemhi River	2001	1,600	Good