If you want to bring a loaded gun with you to a federal dam or reservoir, expect to be turned away. Except for hunting and target range purposes, the U.S. Army Corps of Engineers, which controls most federal water resource development projects, doesn't allow for loaded firearms on Corps lands. Explosives are banned too. Save those for the National Parks.
For Second Amendment advocates in the Eleventh Circuit, that restriction "completely destroys" their right to bear arms. The Eleventh Circuit, however, disagrees, taking a more nuanced look at the regulation's impact on Second Amendment rights.