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Irr Bia Rte 187 over Bannock Creek

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

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

Irr Bia Rte 187 over Bannock Creek in Power 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 1971, making it 54 years old at the 2025 inventory.
It carries about 55 vehicles a day (traffic count year 2023).
It is one of 47 of the 71 inventoried bridges in Power County rated fair (66.2%); 1 (1.4%) 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 83 ft
Location	.4K N&.8 K W.of 161 & I15
NBI structure number	00000000000P437
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I 86 & Ramps over Lanes Gulch	1981	8,300	Fair
I 86 Wbl & Ebl over Cannell Ln;machine Pass	1980	8,300	Fair
I 86 Wbl & Ebl over Calls Road Gs	1979	8,000	Good
I 86 Ebl over Uprr;pocatello Airport	1968	6,750	Fair
I 86 Wbl over Uprr;pocatello Airport	1968	6,750	Fair
I 86 Ebl over Portneuf River	1968	6,750	Fair