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I 86 WB Ramp over I 84

Cassia County, Idaho · rated Good in the 2025 National Bridge Inventory

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

I 86 WB Ramp over I 84 in Cassia County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2020, making it 5 years old at the 2025 inventory.
It carries about 400 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 24 of the 117 inventoried bridges in Cassia County rated good (20.5%); 0 (0.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 395 ft
Location	12.7 E. Heyburn
NBI structure number	000000000010603
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I 84B over Snake River;overland Br	2001	26,000	Fair
I 86 Ebl over I 84 Wbl	2020	19,000	Good
I 84B Sbl over Snake River;heyburn Br.	1977	17,000	Fair
I 84B Nbl over Snake River;heyburn Br.	1955	15,000	Fair
SH 77 over Canal	1985	13,000	Fair
I 84 over Co.rd.;horse Butte Gs	1963	11,500	Fair