yeah deff not man made.
been around a whole lot longer than 1850.
one thing U all know about the lake is on the west end of the lake in mound is where your beloved child hood trucks and tractors were manufactured aka TONKA toy .and the western side swamp was the dump for yrs for that plant.
millions were spent from my city coffers cleaning that up dredging etc and turning it in to a park/marina
the bogs this yr are because of record high water .
they float up with the rising water then tear there roots out of the mucky bottom.
top that with high wind now u get bogs.
cut and past
lk Minnetonkais a 14,528-acre (59 km2) lake in the U.S. state of Minnesota. It is located west-southwest of the Twin Cities of Minneapolis–Saint Paul. The lake is irregularly shaped with numerous bays, peninsulas, and islands that form approximately 125 miles (200 km) of shoreline.[1] The lake is located almost entirely within Hennepin County; however, its southernmost extension, Smithtown Bay, reaches into the City of Victoria, which lies within northeastern Carver County. Lake Minnetonka is divided into two separate sections, the Upper Lake and Lower Lake (which refer to the flow of water from west to east, not geographical location