Christopher Henderson (center) and Markus Seller build a temporary dam across Sam’s Creek during summer camp at Autrey Mill Nature Preserve in Johns Creek on Monday, July 14, 2014.
July 14, 2014 Johns Creek – Christopher Henderson (center) and Markus Seller build a temporary dam across Sam’s Creek during summer camp at Autrey Mill Nature Preserve in Johns Creek on Monday, July 14, 2014. JONATHAN PHILLIPS / SPECIAL