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US 30 over UPRR; Soda Springs Op

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

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

US 30 over UPRR; Soda Springs Op in Caribou 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 1988, making it 37 years old at the 2025 inventory.
It carries about 3,500 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 31 of the 45 inventoried bridges in Caribou County rated fair (68.9%); 2 (4.4%) 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 stringer or multi-beam girder
Length	about 113 ft
Location	Near Soda Springs Ecl
NBI structure number	000000000013740
Condition class	Fair

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
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
SH 34 over Little Blackfoot River	1979	770	Fair