Arizona State Route 366

State Route 366 (SR 366) is a highway in Graham County, Arizona that runs from its junction with US 191 south of Safford to near the summit of Mount Graham. It is a winding mountain road with one half primarily a northwest-southeast route, the other half being northeast-southwest.

State Route 366

Mount Graham Road
SR 366 highlighted in red
Route information
Maintained by ADOT
Length28.33 mi (45.59 km)
Existed1960–present
Tourist
routes
Swift Trail Parkway
Major junctions
West endNear Mount Graham
East end US 191 at Swift Trail Junction
Location
CountryUnited States
StateArizona
Highway system
  • Arizona State Highway System
  • Interstate
  • US
  • State
  • Proposed
  • Former
SR 364 SR 373
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