Presumpscot Watershed Initiative

Geospatial Database

Mouse over a watershed and click to enlarge

Instructions: click on any of the watershed names in the map above to enlarge.

Presumpscot River Watershed


The Presumpscot River watershed is located in Cumberland and York counties. It includes parts of the towns of Buxton, Cumberland, Falmouth, Gorham, Gray, North Yarmouth, Portland, Raymond, Standish, Westbrook, Windham, and Yarmouth.


The Presumpscot River watershed covers 205 square miles.


Approximately 66,000 people live in the Presumpscot River watershed.

Impervious Surfaces:

Impervious surfaces are those surfaces in the landscape that cannot infiltrate rainfall, such as rooftops, pavement, sidewalks, driveways and compacted earth. Impervious surface areas of 10% or greater are often correlated with reduced water quality. Approximately 7% of the Presumpscot River watershed, more than 9,500 acres (15 sq.mi.) of overall area, is comprised of impervious surfaces.

Little Sebago Ditch Brook Sub Watershed Pleasant River Baker Brook Presumpscot Main Stem Sub Watershed N. Branch Little River Douglas Brook Sub Watershed Little River Tannery Brook Sub Watershed Piscataqua River Sub Watershed Black Brook Sub Watershed Colley Wright Brook Sub Watershed Inkhorn Brook Sub Watershed Highland Lake Mill Brook East Branch Piscataqua River Sub Watershed Presumpscot Main Stem Sub Watershed