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US 20 Wbl over Menan Canal

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

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

US 20 Wbl over Menan Canal in Jefferson County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1975, making it 50 years old at the 2025 inventory.
It carries about 9,750 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 97 of the 125 inventoried bridges in Jefferson County rated fair (77.6%); 4 (3.2%) 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 43 ft
Location	3.7 N. Rigby
NBI structure number	000000000012485
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 20 over Garfield Ucon Canal	1972	34,500	Fair
US 20 over Burgess Canal	1975	28,500	Fair
US 20 Eb-wb over SH 48;RIGBY Gs	1976	28,500	Fair
US 20 Ebl & Wbl over Parks Lewisville Canal	1975	19,500	Fair
US 20 Ebl over Snake River;lorenzo Br.	1980	15,250	Fair
US 20 Wbl over Snake River;lorenzo Br.	1974	15,250	Fair