Name: Alison Field-Juma Organization: OARS Phone: 978-369-3956
Assabet River, Hudson through Concord, MA; Concord River from confluence with Assabet to Lowell.
Assabet and Concord Rivers, in Westborough and Hudson to Lowell, mainly the impounded sectionsManagement area description:
Acres in the management area: 550 Listed on EDDMaps? No
Habitat type: River
Was this Early Detection Rapid Response (EDRR)? NoInitial Overall Invasive Distribution Description:
Scattered to heavy, mainly in the shallow, slow-moving sections of the impoundment area of the river. Maps available at CISMA webpage.
Initial Overall Percent Cover of Invasives: 76 - 100%
Reduce the populations of water chestnut to levels that can be managed, with relatively low effort, by hand-pulling. Prevent new areas of infestation and prevent the spread from existing areas.
Approximate project start date: June 1, 2019
Years this project has been ongoing: 4Project summary:
OARS’ Rapid Response Team is hired from June-August to hand-pull water chestnut along the Assabet and Concord Rivers everywhere that it was found. Volunteers also engaged in hand-pulling on several impoundment sections of the river plus the Sudbury River at Rte 2.
Control method: Manual
Disposal method: Composting off site (away from river edge)Detailed project timeline:
June-Aug: Survey the sections to be managed before pulling
June-Aug: Repeat hand-pulling every summer with hired help and/or volunteers
Funding sources: 2016 funding came from two Supplemental Environmental Project penalty funds
Final acres in management: 550
Open to the public: Yes
Able to Provide Tours: Yes
Success Rate: Moderately successful
Current Overall Percent Cover of Invasives:Comments / Takeaways
The population of water chestnut varies in response to summer conditions (rain and temperature), although the plant is an annual the seeds have a long (12+ years) viability in the sediment, and new seeds are transported by wildlife and flooding to new areas. Maintaining consistent control efforts indefinitely is thus essential.
Last Updated: July 21, 2020