Black Hall Pond, Old Lyme


2005 Aquatic Plant Survey Map of Black Hall Pond

Transect Data | Water Data

Black Hall Pond is a 12.6-acre body of water. The western shore is minimally settled, and the homes on the eastern shore have little buffer from the water’s edge. The maximum observed depth was 16.1 feet.
The CAES IAPP 2005 survey found sixteen aquatic plant species. One species, variable-leaf watermilfoil (Myriophyllum heterophyllum), is invasive. It was found as a small patch in the northern section of the pond. All of the vegetation was limited to shallow waters along the pond’s edge.
The dominant species was western waterweed (Elodea nuttallii), which was found through out the shallow areas. Western waterweed was closely followed in abundance by white water lily (Nymphaea odorata) which was found closer to the shore. Watershield (Brasenia schreberi), great water starwort (Callitriche heterophylla), coontail (Ceratophyllum demersum), charaphyte (Chara), Tuckerman's quillwort (Isoëtes tuckermanii), slender naiad (Najas flexilis), large-leaf pondweed (Potamogeton amplifolius), ribbon-leaf pondweed (Potamogeton epihydrus), spotted pondweed (Potamogeton pulcher), humped bladderwort (Utricularia gibba), purple bladderwort (Utricularia purpurea), floating bladderwort (Utricularia radiata), variable pondweed (Potamogeton gramineus), snailseed pondweed (Potamogeton bicupulatus), sedges (Carex), and yellow water lily (Nuphar variegata) were found in small to medium patches in shallow parts of the lake.