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Fs Route No. 312 over Upper W. Branch

Bonner County, Idaho · rated Poor in the 2025 National Bridge Inventory

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

Fs Route No. 312 over Upper W. Branch in Bonner County, Idaho, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1954, making it 71 years old at the 2025 inventory.
It carries about 50 vehicles a day.
It is one of 11 of the 104 inventoried bridges in Bonner County rated poor (10.6%); 11 (10.6%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 32 ft
Location	Upper West Branch
NBI structure number	010408000000185
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 95 over Pend Oreille R;sandpoint	1981	18,500	Fair
US 2 over Sand Creek	1973	18,500	Good
US 95 over US 95NB Off R;sand Creek	2012	12,500	Fair
US 95 over Bridge Street	2012	12,500	Fair
US 2 over Pend Oreille R;oldtown B	1988	11,500	Fair
US 95 over Cocolalla Creek	2017	11,500	Good