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I 84B Sbl over Snake River;heyburn Br.

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

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

I 84B Sbl over Snake River;heyburn Br. in Cassia 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1977, making it 48 years old at the 2025 inventory.
It carries about 17,000 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 93 of the 117 inventoried bridges in Cassia County rated fair (79.5%); 0 (0.0%) 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 1,312 ft
Location	at Burley Ncl
NBI structure number	000000000013675
Condition class	Fair

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 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
I 84 over Juniper Rd;gs NO.1	1968	11,000	Fair