The Smithsonian Butte Back Country Byway follows a short nine mile graded dirt road from its intersection with Utah Highway 59, over Smithsonian Butte, then down to its intersection with Highway 9 at Rockville. This route is best driven from the south to the north because of the spectacular views of Zion Canyon and the surrounding cliffs.
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| Elevation: |
- Grafton Junction: 3,756 feet
- North Entrance: 4,676 feet
- South Entrance: 4,879 feet
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| Directions: |
Turn north onto the byway from Utah Highway 59, about 14.5 miles from the southeast side of Hurricane, at what is known locally as the Big Plain Junction, between mileposts 8 and 9. There is a small sign on the highway indicating the byway. |
| Coordinates: |
Map Coordinates (NAD83):
- Grafton Junction: 37 09.097N; 113 03.538W
- North Entrance (Rockville, Utah): 37 09.097N; 113 03.538W.
- South Entrance (Big Plain Junction): 37 04.520N; 113 06.401W.
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| Weather: |
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