However, the Great Lakes are so big that wind churns up waves and rip currents that can compete with those found in oceans. This year alone, 84 people have drowned in the five Great Lakes.
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Currents develop in lakes from winds across the surface and from temperature patterns and bathymetry along with the Coriolis “force”. The current strengths and directions vary every minute, but in general they display a counterclockwise pattern.
You may have heard about the rip tide or undertow before. These are terms that people commonly use to describe dangerous currents. However, since there are no tides in the Great Lakes (needed to form a rip tide) and currents don't pull a person down under the water (undertow), they are a bit inaccurate.
Relax, rip currents don't pull you under. Don't swim against the current. You may be able to escape by swimming out of the current in a direction following the shoreline, or toward breaking waves, then at an angle toward the beach.
Lakes can be affected by pollution from various sources such as agricultural runoff, urban development, and recreational activities. High levels of bacteria, harmful algae blooms, and pollutants in the water can pose health risks to swimmers.
Know before you goBefore you head out, check online to find out if the swim area is currently monitored, is under advisory, or has been closed for health or safety reasons. This is especially important after a heavy rain.
A small pond is usually 4 to 20 feet deep, while lakes are typically any depth beyond 20 feet. In most lakes, the deepest spot is known as the “last drop” or “end of the lake.” The water in a small pond or a natural spring will not have any depth to it.
Pollutants from residential, agricultural, and industrial areas reduce water quality. Land development decreases the amount of wildlife habitat. Fish populations have been declining in recent years as a result of these threats and increased fishing pressure.