Granite Basin Lake is man-made and about 5 surface acres. It is not stocked with fish. Although fishing is usually rated as only fair to poor, the patient angler can often catch bluegill, largemouth bass, or catfish. A State of Arizona fishing license is required for anglers over the age of 13 years. Boats powered by electric motors and oars/paddles are allowed. Swimming is not permitted. - Prescott National Forest
Heres is a printable pdf for the Granite Basin Recreation Area that might help you out if your camping and hiking too.