Total height ~5.5 cm.
It seems if Lake Agassiz drained and refilled several times, but emptied finally and completely about 8 ka, when the ice of Hudson Bay melted and allowed water from the Lake to come charging in. Geologists estimate that drainage of the Lake raised world sea levels by three to ten feet. Lakes Manitoba, Winnipegosis, Lake of the Woods, and Winnipeg, all residual catchment basins of the Lake, remain and correspond to regions where the original lake was deepest. Though giants by modern standards, the residual lakes retain only a small fraction Agassiz's original waters (McCarthy, 2014).
McCarthy, E.M., 2014, Lake Agassiz, Vast Prehistoric Lake: Online Biology Dictionary www.macroevolution.net