Invasive Plant Cleanups
As a highly developed region, the Charles River watershed has extensive invasive and nuisance plant overgrowth challenges. The growth of invasive plant species will worsen with the impacts of climate change, making it essential to address this growing threat now. Invasive plant species threaten terrestrial and aquatic ecosystems by degrading water quality and reducing biodiversity and flood storage capacity. CRWA has developed projects to help monitor invasive plant growth and address underlying causes of nutrient overloading in the Charles River. These projects include water quality monitoring, green infrastructure implementation, and environmental advocacy. In addition to these strategies, we need your help with invasive plant cleanups!
American Shad Restoration
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One of the largest members of the herring family, American shad can reach up to 30 inches in length and weigh 7-8 pounds. The shad is one of five species of anadromous (fish born in freshwater) fish found in the Charles River. American shad spend the majority of their lives in the ocean, and return to their native freshwater to spawn.
Shad were plentiful in the Charles until the mid-1800s, and some historical records identify shad in the Charles as early as 1633. After 1850, the population began to decline due to the construction of dams and the degradation of water quality. Based on CRWA’s target fish community work in the past decade, the Charles should support a large, viable shad population of up to 30,000 adult fish; however, only small numbers of adult shad are observed in the river each year. To help restore the shad population to pre-development levels, CRWA embarked on a collaborative project with the Massachusetts Division of Marine Fisheries (MA DMF) and the U.S. Fish and Wildlife Service (US FWS) in 2006. The program aims to restore a viable population of American shad in the Charles, improve the ecological health of the river by introducing a native species, and create a local sport fishery for anglers. Since 2006, over 26 million shad larvae have been released into the Charles River. Since 2011, the released American shad have returned each year to the Charles River to spawn. Improved tracking techniques currently utilized by MA DMF and US FWS are beginning to provide a fuller picture of the challenges facing the American shad in the Charles River. |
Shad larvae are sourced from adult shad found in the Merrimack River near the Essex Dam in Lawrence, MA, and then raised at the US FWS hatchery in Nashua, NH. These juvenile shad, or shad fry, are then marked, using a special bath, so they can later be identified and tracked when they return to the Charles to spawn.
In addition to the American Shad, other herring including Alewife and Blueback, are returning to the Charles River in large numbers. The Charles River now supports one of the largest Blueback herring runs in Massachusetts.
In addition to the American Shad, other herring including Alewife and Blueback, are returning to the Charles River in large numbers. The Charles River now supports one of the largest Blueback herring runs in Massachusetts.
Watertown Dam Removal
©Sean McNamara
The Watertown Dam is a 180-foot long, 8-foot high concrete weir structure located in Watertown, MA. CRWA, the Watertown Conservation Commission, and others have long expressed interest in evaluating the potential to remove the Watertown Dam. This dam has significant hazard potential, meaning a failure may cause loss of life and damage homes; removal would restore the free flow of water and sediment, allow fish and other wildlife to travel between portions of the river, help migratory fish populations rebound, and eliminate expensive dam maintenance costs, among many other benefits.
In the spring of 2016, with a letter for support from the Commissioner Leo Roy of the Massachusetts Department of Conservation and Recreation (DCR; the dam owner), we applied to DER for support in conducting a feasibility study to investigate removal. The Watertown Dam Removal was accepted as a Provisional Project pending completion of a feasibility study and support for removal from DCR.
In the spring of 2016, with a letter for support from the Commissioner Leo Roy of the Massachusetts Department of Conservation and Recreation (DCR; the dam owner), we applied to DER for support in conducting a feasibility study to investigate removal. The Watertown Dam Removal was accepted as a Provisional Project pending completion of a feasibility study and support for removal from DCR.