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SH 55 over Boulder Creek

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

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

SH 55 over Boulder Creek in Valley 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 1999, making it 26 years old at the 2025 inventory.
It carries about 6,000 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 71 of the 153 inventoried bridges in Valley County rated fair (46.4%); 10 (6.5%) 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 57 ft
Location	at Donnelly Scl
NBI structure number	000000000014851
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SH 55 over N. Fk. Payette River	2013	7,800	Fair
SH 55 over N.fk.payette R;lardo	2014	7,400	Fair
SH 55 over Lake Fork Creek	1985	6,500	Fair
SH 55 over Lake Fork Creek Canal	1998	6,000	Fair
SH 55 over N. Fk. Payette River	2015	5,700	Good
SH 55 over Gold Fork River	2016	5,200	Fair