The Jones River watershed is thirty square miles overall and, includes the four Silver Lake towns of Kingston, Pembroke, Halifax, and Plympton as well as portions of Duxbury and a very small part of Plymouth. The Jones River was formed as the outlet to Glacial Lake Taunton about 15,000 years ago. It is the largest river draining to Cape Cod Bay, and represents a habitat demarcation zone for a variety of species. The river is a low gradient coastal stream, 7.5 miles in over all length of the main stem with nine contributing subwatersheds.
The major tributaries of the River are Smelt Brook, Halls (Stony) Brook, Furnace Brook, Fountainhead Brook, Jones River Brook, Pine Brook and Silver Lake. The Jones River headwater, Silver Lake, is largely spring fed, and at 80 feet deep and a mile square, is one of the largest natural lakes in Massachusetts. This remnant of the Wisconsin period is the likely apex of the Plymouth-Carver Aquifer and is near the surface divide of Jones, the North, and Taunton River systems. For the last 100 years, the lake has been most valued for its water supply everyday 10 million gallons are diverted to Brockton and flushed down the Taunton River.
The Silver Lake watershed represents about 20% of the Jones River watershed that drains to the main stem above the Elm Street dam. USGS has maintained a Stream gage at Elm St. since the mid-1960s. The town of Kingston recently upgraded this gage for instantaneous readings which can now be accessed via the USGS Stream Stats on the
www.usgs.gov website. Until recently, loss of flow from Silver Lake to the Jones River as a result of the diversion was an accepted practice.
Excerpts from Chapter 5 of the Southcoastal Watershed Action Plan.