General Maps
New Hampshire's coastal watershed includes 10 sub-watersheds and two major estuarine systems: Great Bay and Hampton-Seabrook Harbor. The following maps illustrate these systems and include major roadways and geographic features to help orient visitors to the Seacoast.
Coastal WatershedCoastal Watershed Towns
Sub-watersheds
Great Bay
Hampton-Seabrook Harbor
Customized maps for each town listed below display 1990, 2000, and 2005 impervious surfaces, conservation lands identified in the Land Conservation Plan for New Hampshire’s Coastal Watersheds, roads, surface waters, and impervious surface summary statistics. UNH Complex Systems Research Center developed impervious surface estimates for the NHEP (see the CSRC’s Final Report for a description of the methodology and results). The 2005 data are based on the same technology that was used in previous impervious surface mapping projects using 1990 and 2000 datasets; therefore these maps show trends in impervious surface over a 15-year time span. The GIS data are available from GRANIT. For more information on the maps contact Phil Trowbridge.
Buffer Characterization Maps
The Complex Systems Research Center (CSRC) at the University of New Hampshire conducted a characterization of the buffers around 2nd order and higher streams within the Piscataqua/Coastal Basin of New Hampshire. GIS and remote sensing data archived in the NH GRANIT database were used to map land use, impervious surface coverage, and transportation infrastructure within standard buffers around each stream segment. These factors were then analyzed to produce a categorical indicator representing the status of each stream. The results are presented on community-based maps displaying stream characterizations and the corresponding acreage tables. In addition, the data have been made available as digital data layers archived in the GRANIT database.
To access digital data layers go to GRANIT. To receive a hard copy of your towns map please contact Dave Kellam.
