43 CFR § 423.36 - Swimming.
(a) You may swim, wade, snorkel, scuba dive, raft, or tube at your own risk in Reclamation waters, except:
(1) You may not swim past signs, fences, buoys, or barriers marking public access limits to, or within, 100 yards of Reclamation structures including, but not limited to, dams, powerplants, pumping plants, spillways, water conveyance gates, intake structures, stilling basins, and outlet works;
(2) In canals, laterals, siphons, tunnels, and drainage works;
(3) At public docks, launching sites, and designated mooring areas; or
(4) As otherwise delineated by signs or other markers.
(b) You must display an international diver down, or inland diving flag in accordance with State and U.S. Coast Guard guidelines when engaging in any underwater activities.
(c) You must not dive, jump, or swing from dams, spillways, bridges, cables, towers, or other structures.