State Route 366 - Swift Trail


Arizona 366 travels from US 191 west through the Coronado National Forest up to the top of Mt. Graham and the Pinaleño mountain range. The road was added to the state highway system in 1961-62.
Arizona 366 is a winding road, with sharp curves and no guardrails. The road is quite scenic, but only paved for the first 21 miles (between miles 114 and 136). The last 7 miles are gravel, and are closed to vehicles from November 15 to April 15.
There are no reassurance markers on Eastbound Arizona 366.
Arizona 366 is designated as the Swift Trail Parkway scenic road. The road was designated as a scenic highway in 1993.

Trucks above 40 feet are not recommended along Arizona 366. There is a truck turnaround just after this sign.
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SR 366 is subject to daytime closures. This could be due to the Mt. Graham observatory located atop the mountain.
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SR 366 is a winding, twisting highway as it climbs Mt. Graham. This is advance warning of the upcoming curves.
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After reaching the 8500' tall Lady Bug Saddle, Arizona 366 levels out and follows the top of the mountain, with a much more gradual climb to the Ranger Station, where the road ends.
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There is a downhill grade all the way from Lady Bug Recreation Area (from 8300 feet down to 2900 feet in 19 miles).
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The vistas along SR 366 face all the way down to SR 191. This is one of the places where Arizona's famed clear skies can be seen quite easily.
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This bridge over Wet Canyon was constructed in 1936 by the CCC. Wet Canyon is a well-preserved riparian habitat, one of the few remaining in Arizona.
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While descending along the north side of the canyon, the vegetation gets less dense and more shrub-driven.
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The panoramas towards the San Simon Valley are amazing from the descent of eastbound SR 366.
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Beyond the final set of curves, SR 366 enters the broad alluvial fan as it descends towards U.S. 191.
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SR 366 ends at U.S. 191. Turn left for U.S. 191 north to Safford, or right for U.S. 191 to Interstate 10.
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Photo Credits:
- Kevin Trinkle: 11/11/07
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Page Updated Sunday November 18, 2007.