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Chesterfield Res R over Chesterfield Canal

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

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

Chesterfield Res R over Chesterfield Canal in Caribou 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 2005, making it 20 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 2 of the 45 inventoried bridges in Caribou County rated poor (4.4%); 2 (4.4%) 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	Steel stringer or multi-beam girder
Length	about 45 ft
Location	0.5 N 4.2 W Chesterfield
NBI structure number	000000000023186
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
SH 34 over Uprr;sodas 3RD E.st Op	1978	5,600	Fair
US 30 over UPRR; Soda Springs Op	1988	3,500	Fair
SH 34 over Bear River;grace Bridge	1974	2,200	Fair
SH 34 over North Extension Canal	1978	2,200	Fair
Blackfoot River Rd over Blackfoot River	1980	1,000	Good
SH 34 over Blackfoot River	1979	770	Fair