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 |
Production

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. The state boundary was removed from MAJ_BAS and the existing internal watershed boundaries were modified or adjusted to conform to the 1:25,000 Hydrography layer. To produce the watershed boundaries that extend beyond the state boundary, sub-basin data from the adjacent state GIS databases were incorporated. Some of these were adjusted to conform to the Networked Hydro Centerlines data, which was developed for use in the Watershed Analyst. These data are used for modeling stream flow. In some cases, the out-of-state sub-basins were clipped to include data that affect stream flow into or out of Massachusetts. In addition, the coastline was buffered for generalization. Non-contiguous basins, such as the two parts of the North Coastal watershed, were combined and connected with the coastal buffer to conform to the naming scheme as defined in the Stream and River Information System (SARIS).
Attributes
The polygon attribute table contains the following fields:BAS-ID | Corresponding ID in MAJ_BAS layer |
NAME | Watershed name |
SARIS_NUM | Watershed ID according to SARIS |
SQ_MI | Area in square miles of each polygon |
AREA_ACRES | Area in acres of each polygon |
Maintenance
MassGIS is maintaining this datalayer.Last Updated 1/10/2017
Items
Contributor | |
---|---|
Modified Date | 2020-11-19 |
Release Date | 2018-12-07 |
Identifier | 2d1fcba1-71a8-4bc2-8597-e383863c2a0f |
Spatial / Geographical Coverage Location | Massachusetts |
License | |
Author | |
Contact Name | MassGIS |
Contact Email | |
Public Access Level | Public |
Data Quality | False |
Content Type | |
Language | English (United States) |