Lake Minnetonka History
ISLANDS: The number of islands in Lake Minnetonka varies according to the different definitions of islands. The 1993-revised U.S. Geological Survey topographic maps lists 38 islands. The 1944 Hudson’s Indexed Map of Lake Minnetonka and a 1964 map made by the Hennepin County Highway department lists 23 islands. Dredging and filling of the lake’s original features has created, connected and obliterated islands.
STATISTICS: The lake is made up of a number of a series of bays, points and islands with 31 interconnecting channels covering 22.2 square miles of water (14,043 acres) and 125 miles of main lake shoreline not counting islands and channels.
The drainage extends over 123 square miles; the deepest point is Crystal Bay (101 feet).
11 miles long,
6 miles wide
14,310 acres of water
101 feet deep (Crystal Bay)
125 miles of shoreline (some older statistics list 110 miles)
Contains 15 lakes of 3 different kinds
Formed by melting ice blocks in glacial moraines 15,000 years ago
929.4 feet above sea level at the outlet, Grays Bay dam
130,340,400,000 gallons or 400,000 acre feet water capacity
10.9 miles greatest length (Halsteds Bay to Grays Bay)
30 feet average depth
April 12 – 17 is range of average ice-out dates
28 inches maximum ice thickness
20 – 24 inches average ice thickness
123 square miles is area of watershed, including Minnetonka
922.7 feet above sea level modern low water level, December 20, 1937
931.43 feet above sea level modern high water level, Sept. 12, 1951