Grindstone Mesa Spur Trail (91B) is a hiking trail in Otero County and Lincoln County, New Mexico. It is within Mescalero Apache Reservation and Lincoln National Forest. It is 0.7 miles long and begins at 7,880 feet altitude. Traveling the entire trail is 1.4 miles with a total elevation gain of 212 feet. Grindstone Mesa (elevation 7,887 feet) can be seen along the trail.
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