Wisconsin Code § 30.70

Skin diving
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No person may engage in underwater diving or swimming with the use of swimming fins or skin diving in
waters other than marked swimming areas or within 150 feet of
shoreline, and no person may engage in underwater diving or
swimming with the use of self-contained underwater breathing
apparatus in waters other than marked swimming areas, unless
the location of such diving or swimming is distinctly marked by
diver’s flag, not less than 12 inches high and 15 inches long, displaying one diagonal white stripe 3 inches wide on a red background, and of height above the water so as to be clearly apparent
at a distance of 100 yards under normal conditions, and so designed and displayed as to be visible from any point on the horizon. Except in case of emergency, anyone engaging in such diving or swimming shall not rise to the surface outside of a radius of
50 feet from such flag. No person engaged in such diving or
swimming shall interfere with the operation of anyone fishing nor
engage in such diving or swimming in established traffic lanes;
nor shall any such person alone or with another, intentionally or
unintentionally, block or obstruct any boat in any manner from
proceeding to its destination where a reasonable alternative is unavailable. A reasonable alternative route is available when the
otherwise unobstructed boat can proceed to its destination without reducing its lawful speed, by passing to the right or to the left
of a marked diving operation.

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