Idaho State Highway 40

State Highway 40 (SH-40) is a 2.737-mile-long (4.405 km) state highway in Bannock County, Idaho, United States, that serves the city of Downey. The highway travels due east from an interchange with Interstate 15 (I-15) to an intersection with U.S. Route 91 (US-91) in Downey.

State Highway 40

SH-40 highlighted in red
Route information
Maintained by ITD
Length2.737 mi (4.405 km)
Major junctions
West end I-15 west of Downey
East end US 91 in Downey
Location
CountryUnited States
StateIdaho
CountiesBannock
Highway system
  • Idaho State Highway System
  • Interstate
  • US
  • State
SH-39 SH-41
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