Do the great lakes have tides?

no they dont because the water is constantly moving Aren't the oceans in contant motion too?

Actually, YES they do. All bodies of water are affected by the gravity of the moon - http://home.hiwaay.net/~krcool/Astro/moon/moontides/

They do, but not as high as the oceans, because they are much smaller. Biggest are in Lake Superior because of it's size, and Lake Erie because it is shallow. But the tides are only about 1 - 5 cm.... and that is very difficult to measure against waves and air pressure differences from one part of the lake to the next which also effects water level, among other things. So although they have tides, the tides are so small that you won't notice a difference unless you have very sophisticated instuments and information to measure them.

For this questions specifically: http://www.great-lakes.net/teach/chat/answers/100100_tides.html