And, to further add to the problems, many of the lakes have a huge influx of phosphorus from the non-point source runoff (including farm waste and lawn fertilizers). The phosphorus can stimulate weed growth and algae blooms.
Then, of course, there's the zebra mussels, sea lamprey,flowering rush
purple loosestrife . . .
Hmmm. What a mess. Nobody seems to have listened to the Lorax. (for those who remember the Dr. Seuss story)
[color:"green"]At the far end of town
where the Grickle-grass grows
and the wind smells slow-and-sour when it blows
and no birds ever sing excepting old crows...
is the Street of the Lifted Lorax
And deep in the Grickle-grass, some people say,
if you look deep enough you can still see, today,
where the Lorax once stood
just as long as it could
before somebody lifted the Lorax away . . .
[/color]