Ranked by GIS-computed surface acres from Michigan DNR lake polygons — one consistent state source for every lake, which can differ modestly from older published figures.
The Great Lakes are excluded — this list ranks inland lakes.
Lakes whose mapped polygon could not be confidently matched are excluded rather than guessed.
Lakes under 50 acres are excluded from rankings.
Public access inventories are not yet tracked for Michigan, so access is never shown or ranked here.
FAQ
Shiawassee County lake records
What is the biggest lake in Shiawassee County?
Aginaw Lake — Aginaw Lake in Shiawassee County is the biggest inland lake in Shiawassee County by Michigan DNR GIS acreage, at 72 acres.
Source data: Michigan DNR GIS lake polygons as aggregated by LakeList. GIS-computed acres can differ modestly from older published figures.Lake outlines are shoreline shapes from LakeList and the USGS National Hydrography Dataset; they illustrate a lake's form and are not depth or navigation charts.