Also included are watershed outlet positions and selected gaging station locations. The coverage was originally created to support wetlands mitigation and water quality monitoring programs. All but 250 of the more than 1770 quads for the state were delineated during the late 1970s. Another significant review and revision was conducted in 1999, when some minor watersheds were reassigned to other major watersheds, based on new information. While Basins 95 is static, Minnesota watersheds is maintained regularly.
All polygons are closed and lines intersect where intended.
Completeness Data are complete at major and minor watershed levels. Watershed entitiy names are complete at the province, major watershed, and basin level. The largest contour interval used during the interpretation process was 20 feet. Undersized watersheds were combined with one or more watersheds to meet the 5 square mile minimum size criteria. Watersheds in the south-central portion of the state were most effected by the updates.