Hello Mike,
What a funny coincidence that you were at Buckeye lake the day I posted this. It looks as though that area was a rather nice vacation area with a large swimming pool, dance hall and marina area. Like many such areas it appears that those things are gone now but the lake still looks like an interesting place to run an Amphicar, many islands and houses to check out. Like you suggested this lake was another canal reservoir that was hand dug around 1825 so I suppose it, like Grand Lake St. Mary, is quite shallow. The aerial photos on Google Earth have the water looking quite greenish.
Hope all is going well for you and yours,
John Friese
67 White
67 Red