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SH 31 over Rainey Creek

Bonneville County, Idaho · rated Good in the 2025 National Bridge Inventory

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

SH 31 over Rainey Creek in Bonneville County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2010, making it 15 years old at the 2025 inventory.
It carries about 2,500 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 69 of the 213 inventoried bridges in Bonneville County rated good (32.4%); 3 (1.4%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 51 ft
Location	In Swan Valley
NBI structure number	000000000013831
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 20 over Porter Canal	1966	38,000	Fair
US 20 Ebl & Wbl over Snake R.;johns Hole Br.	1966	38,000	Fair
US 20 over Sma 7096;RIVERSIDE Dr.ic	1969	38,000	Fair
US 20 over Sage Canal	1970	34,500	Fair
US 20 over UPRR	1966	32,000	Fair
US 20 Wbl & Ebl over Sma 7076;LINDSAY Blvd.ic	1966	32,000	Fair