John Hoffnagle Loop is a hiking and biking trail in Napa County, California. It is 6.3 miles long and begins at 2,070 feet altitude. Traveling the entire trail is 12.7 miles with a total elevation gain of 3,251 feet. The Beehive (elevation 2,733 feet) and Flat Top (elevation 2,730 feet) and the Wild Lake (elevation 2,103 feet) reservoir can be seen along the trail.
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