2019 Cossayuna Lake Management Plan         


      To maintain the integrity of the spillway structure

       ·        Regularly survey the spillway to assess maintenance needs

      To manage the water level

       ·        The water level reduction of the lake has a maximum of 20 inches.  The water level will be lowered before the lake freezes. This water level adjustment is just                            enough to provide shoreline protection from erosion and ice scouring.

      Begin monitoring the water level in the spring as soon as the ice goes out.
      Establish and maintain the summer level at 6 inches above the bottom of the notch in the top of the spillway via the 6 inch board.

   2. Maintain / improve the water quality in Cossayuna Lake at a level which supports such activities as fishing, swimming, and boating.

       Management of non-native invasive weeds

       ·        Through data collection and at least two lake surveys annually, the board of directors will seek to implement the most effective and targeted herbicide program, if                   in fact, treatment is necessary in 2019.

       ·        All proper herbicide permitting through DEC, notification and signage will be implemented in accordance with all laws.

       ·        Identification of weeds in front of private property will be made available upon request to help educate riparian owners.

       ·        Harvesting of curlyleaf pondweed in open waters will be done whenever and wherever possible depending on time and need throughout the growing season, as                    this non-native invasive weed is an annual seed dropper.

       ·        Harvesting of milfoil in open waters will be done if we determine that the weed bed is in a high boat traffic area, and to keep the outlet flowing.

      Funding from the towns, county and state will be sought annually for open water harvesting

      Management of native weeds

      The dock harvesting will run from mid May until the beginning of September with a paid work crew, depending upon funds received from individual property owners.  A        minimum of three cuts will be provided per season.

      Coontail will be harvested in open waters whenever and wherever it is found as it is an aggressive native weed.


·        Only 50% of any given NYS identified wetland area in the lake will be harvested and/or treated annually.

   3.  Minimize the introduction of nutrients and sediment into the lake. 

       To education stakeholders regarding best practices.

       ·        Seek to obtain free educational materials through State sponsored organizations.

       ·        Provide a speaker for weed identification.

       ·        Encourage stakeholders to use non-phosphorus products on their lawns and in their home.

       ·        Encourage shoreline owners to implement a Shoreline Buffer Zone

      Provide information on permits needed for bank stabilization

      Encourage the involvement  of the Argyle and Greenwich Town Boards

      Provide information on septic system care.

      Provide information on boat cleaning via newsletter and inspections at the launch

      To reduce nutrient loading via road runoff, terrain runoff and stream runoff.

             Continue to work with various highway departments and the county soil and water commission and DEC to encourage the best practices in road repairs and salt                     application.

      With the Upper Hudson Watershed Coalition develop a list and correction plan with the towns and Washington County Soil and Water Dept. of priority issues around            the lake.

        ·        Investigate grants to help pay for the needed work.

      To reduce contamination via septic systems around the lake.

      Continue to monitor the environment to ensure that building codes and sewer discharge regulations are observed.

       ·        Work with the Towns and State to develop a long range plan to address septic concerns.

   4.  Monitor the water quality through research activities designed to assess such factors as lake usage, water clarity, oxygen saturation, bacterial contamination.

        Work to get a team of volunteers to test areas of concern for nitrates, phosphates, and bacterial contamination and utilize our testing equipment to assess oxygen and          conductivity along with bottom sludge.

        Continue to collect lake water data via CSLAP (Citizens Statewide Lake Assessment Program) membership.

        Provide information on well water testing.