Yes and No
http://www.mvk.usace.army.mil/lakes/index.php?p=rules#13
327.13 Explosives, Firearms, Other Weapons and Fireworks.
The possession of loaded firearms, ammunition, loaded projectile firing devices, bows and arrows, crossbows, explosives or explosive devices of any kind, including fireworks, is prohibited unless: (1) in the possession of a Federal, state or local law enforcement officer; (2) being used for hunting or fishing as permitted under Section 327.8, with devices being unloaded when transported to, from or between hunting and fishing sites; (3) being used at authorized shooting ranges; or (4) written permission has been received from the District Engineer.
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The way I am reading this, it can't be loaded unless you are actually fishing.