The site was constructed and is maintained by volunteers from the Rim of the World Interpretive Association. A donation is requested for those keeping the Arboretum trail guide. National Forest Adventure Pass required. Go Back To Top of Page 9. The trail is specifically designed and maintained to accommodate the needs of the visually and physically disabled.
All interpretive signs are in distinctive print and braille.
National Forest Adventure Pass required. Go Back To Top of Page 10. The trail leads to bedrock mortars used by the Serrano Indians to grind acorns and to make flour. The Serrano came to this area each spring because of the plentiful acorn crop and the mild weather. Bedrock mortars were formed by the grinding action of mono and pestel stones.