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Slug Creek Rd over Blackfoot River

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

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

Slug Creek Rd over Blackfoot River 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 superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1978, making it 47 years old at the 2025 inventory.
It carries about 60 vehicles a day (traffic count year 2023).
Its listed owner is the county 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 tee beam
Length	about 49 ft
Location	3.9 N. 7.3 E. Conda
NBI structure number	000000000023275
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
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