/June 2000/ *The Major Watersheds layer was originally based on the Major Basins layer and then modified to fit the needs of the MassGIS Watershed Analyst project.* Download this layer [1] MassGIS has produced a statewide digital datalayer of...
/April 2017/ *This datalayer contains the watershed extents for all surface water supplies including active, inactive, emergency, sources outside of Massachusetts, watersheds that extend into other states and watersheds of sources from other states...
/October 2005/ /November 2005/ *This dataset is a digital hydrologic unit boundary layer that is at the Subwatershed (12-digit) level. The layer also includes delineations at the Watershed (10-digit) and Subbasin (8-digit) levels. Each basin is...
/November 2005/ *This layer represents the eight mega-drainage basins for Massachusetts, aggregated from the Major Basins layer.* Download this layer [1] This layer represents the eight mega-drainage basins for Massachusetts, aggregated from the...
/March 2003/ *MassGIS has produced a statewide digital datalayer of the 27 major drainage basins of Massachusetts as defined by the USGS Water Resources Division and the MA Water Resources Commission.* Download these layers (ESRI Shapefiles with...
/December 2007/ * This is a statewide digital datalayer of the approximately 2300 sub-basins as defined and used by the USGS Water Resources Division and the Mass Water Resources Commission and as modified by Executive Office of Environmental...
