This zip archive contains six separate shapefiles. One each for the lake watersheds of Mendota, Monona, and Wingra basins.Yahara_Basin: This polygon shapefile is the full Yahara River watershed delineated using LIDAR elevation data for Dane County and a 10m DEM from the USGS for Columbia and Rock counties. In addition, sewersheds from the city of Madison and a field-checked basin map from Dane Co LWRCD was used.Yahara_subBasins: This is the same as Yahara_Basin except with all of the major sub-basins delineated as well.Yahara_intBasins: This polygon shapefile consists of the internally-drained basins in the Yahara Basin. These were determined using the same elevation sources as in Yahara Basin. [These areas do not have a natural outlet (except during very large flood events...e.g., some overflowed in 2008)]