MWRA to Temporarily Lower Water Level at Chestnut Hill Reservoir for Invasive Plant Control

Update: We continue to await a deep freeze period to evaluate ice penetration to invasive plant roots.  In past winter drawdowns, the refill of the reservoirs is generally completed the refill by the end of February.

Local residents and visitors walking the perimeter path of the Chestnut Hill Reservoir will notice a bit more exposed shoreline in the coming months.

MWRA will perform a drawdown of the reservoir, lowering the water to 10 feet below normal elevation in order to control the growth of aquatic invasive plants.

A slow drawdown will begin on November 1, with the goal of reaching the target elevation by December 1. MWRA will monitor the response of the exposed areas to drawdown and, once it has been determined that a successful depth freeze has occurred, the water level will be restored.

The timing of water level restoration depends on temperatures and snowfall, but will likely occur in January. The MWRA drawdown plan follows MassWildlife Department guidance to be protective of fish, wildlife and their habitats.

The public is advised to not enter into the areas where the reservoir has been drawn down due to unstable footing on the rip rap stones, plant matter and deep mud, which could be unsafe.