John W. Flannagan Dam and Reservoir is an ideal place for camping adventures of all kinds. John W. Flannagan Dam and Reservoir is filled with the activities, sights, and experiences to make everyone in your crew a happy camper. At The Dyrt, campers like you share their favorite spots, plus tips and photos. No matter where you're headed in John W. Flannagan Dam and Reservoir, you'll find the best spot for you and your camping crew.