The U.S. Army Corps of Engineers will apply tracer dye to the Connecticut River throughout the month to improve understanding of water exchange dynamics.
The move forms part of a concerted effort to control the spread of the invasive hydrilla plant.
The project is scheduled at four designated test sites: Keeney Cove in Glastonbury, Chapman Pond in East Haddam, Chester Boat Basin in Chester and Soldon Cove in Lyme.