Warning! Agenda 21 Language Stay Away!
http://www.great-lakes.net/teach/envt/levels/lev_1.html This instructs us in the cycles of water levels for each of the Great Lakes as well as Lake St. Claire. There are well described cycles ~ easily modeled ~ and it’s not Global Warming controlling this one. There are locks and dams that make sure the Lakes are navigable under a variety of conditions.