Michigan Department of Natural ResourcesThe Michigan's Major Watersheds - Subbasins shape file depicts the drainage areas of 20 square miles or greater at geographic features such as the mouth of a river or the location of a USGS stream flow collection station. The shape file is used to determine hydrologic parameters for determining a range of flows in watershed analysis.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/6829ad09228642eeb8748f4e93d2f800_16engState of Michigan Open Data PortalPublicWatershed Basins [Michigan]Web servicesMichiganLast Modified: 2025-04-22