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Irr Bia Rte 904 over Owyhee River

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

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

Irr Bia Rte 904 over Owyhee River in Owyhee 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 5 (fair condition) on the 0-9 scale.
It was built in 1987, making it 38 years old at the 2025 inventory.
It carries about 20 vehicles a day (traffic count year 2024).
It is one of 29 of the 49 inventoried bridges in Owyhee County rated fair (59.2%); 4 (8.2%) 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 119 ft
Location	17.4 Km NW of Owyhee
NBI structure number	00000000000H311
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 95 over Snake River;homedale Br.	1969	11,000	Fair
SH 55 over Snake River (marsing Br)	2020	7,500	Fair
US 95 over B Line Canal	1982	3,600	Good
US 95 over Jump Creek	1982	3,200	Good
SH 19 over Succor Creek	2017	2,500	Good
SH 45 over Snake R.(walters Ferry)	1972	1,900	Fair