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Watershed hydrologic units (HU) are generally subdivided into 5 to 15 units. The average size of an 8-digit sub-basin hydrologic unit is about 450,000 acres. The typical 10-digit watershed size is 40,000 to 250,000 acres, while the typical 12-digit subwatershed is 10,000 to 40,000 acres. 8- and 10-digit watersheds can be derived from 12-digit watershed shapefiles.
The Mississippi River â Headwaters watershed has approximately 685.05 river miles (NHDPlus - 1:100k source scale, flowline layer) and contains more than 1,000 lakes with a total acreage of 180,375. [[nid:7633]] The Mississippi River - Headwaters watershed consists of 1,255,105 acres (1,961 square miles) in the far north part of the basin. The watershed contains the headwaters of the Mississippi River at Lake Itasca in Itasca State Park.