County Road 46 Oo is a hiking, biking, and horse trail in Saguache County, Colorado. It is within Rio Grande National Forest. It is three miles long and begins at 9,905 feet altitude. Traveling the entire trail is 6.1 miles with a total elevation gain of 1,010 feet. The American Revenue Mine (elevation 9,951 feet) and Marine Lode Mine (elevation 9,856 feet) quarries can be seen along the trail. There are also reservoirs along the trail.
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