Practically in my backyard and I just discovered it today thanks to Deb of PlanetUltra. This is part of the course for the PlanetUltra Volcano Ride (120k). Panoramic views, nice road quality, and some solid climbs take you from the back of Gunlock out to the Enterprise Reservoir. I turned around ~16 miles in due to self-inflicted cleat failure and sore knees from Thursday’s Epic ride up Smith Mesa (post to come). If you go all the way to the reservoir, it’s ~20+ miles each direction and 3-5k elevation.