Thanks both of you for your comments!
Great advice dicksewerrat, it would be time well spent looking at other lakes in the area.
And it has been awhile since I've been let out of my cubicle.
A client is having us look into a project that involves constructing a 200+ Acre recreational (boating, sking, fishing) "Sand Pit" lake. The project is located in the midwest in a broad sandy flood plain not far from a river. I have a good handle on the flood plain and enviromental issues, but...