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N. St. Charles over Lemhi River

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

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

N. St. Charles over Lemhi River in Lemhi County, Idaho, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1948 and reconstructed in 1965, making it 77 years old at the 2025 inventory.
It carries about 310 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 9 of the 114 inventoried bridges in Lemhi County rated poor (7.9%); 9 (7.9%) 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 79 ft
Location	0.4 N. 0.3 E. Salmon
NBI structure number	000000000032755
Condition class	Poor

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 Salmon River;carmen Br.	1970	2,100	Fair
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