Altona · Boulder County · CO
Grindstone Quarry Trail is a 1.5-mile trail near Altona, in Boulder County, CO. It climbs 326 ft and descends 122 ft, between 5,705 ft and a high point of 5,973 ft. The surface is dirt. Mapped for hiking, trail running, equestrian.
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Trail data © OpenStreetMap contributors (ODbL). Elevation: USGS 3DEP. Open the interactive map for routing, weather, and offline use.