Harvey Gap (do not call it Grass Valley Reservoir) is a wonderful body of water for fishing and kayaking north of Silt, Colorado.
Non motorized boats only, so its a great place for paddleboarding or kayaking.
Fishing and in the winter ice fishing are great activities here. Its peaceful and serene.
No camping or pets.
Harvey Gap is a state park so its another great reason to purchase a state parks pass, or have cash on hand to put in the envelope.