Bashan Lake, East Haddam

Bashan Lake

2004 Aquatic Plant Survey Map of Bashan Lake

(1.7 MB, .pdf format*)

Transect Data (236 KB, .pdf format*) | Water Data

            The 273-acre Bashan Lake supports a community of at least 16 submerged and floating-leaved aquatic plants, which were collected during a survey in early September 2004.  A boat-based survey based on visual observations and grabs with a long-handled rake was augmented by observations with an underwater video camera system that permitted detailed inspection of the deeper water in the lake, which reaches a maximum depth of 47 feet. Mean depth of the lake is 17 feet.

            One invasive species, Myriophyllum heterophyllum, occurs in the lake, and it has been treated with herbicides for several years due to residents’ complaints. Residential development around the lake is extensive, and there are docks on the shoreline. The lake is widely used for recreational fishing, and has a public boat ramp exists at the southern end of the lake.  The only beaches are maintained by private lake associations and are closed to the public.

            Utricularia purpurea occurred most widely in Bashan Lake, covering the bottom except in the deepest water. Myriophyllum heterophyllum was also abundant, although its distribution was more patchy than that of U. purpurea. Myriophyllum  heterophyllum occurred in extensive patches on the southeast side of the lake and in coves where the water was less than 15 feet deep, with smaller but equally dense patches occurring elsewhere around the lake.

            Elodea nuttallii was found within Myriophyllum heterophyllum in several coves at the southern end of the lake and on the eastern side.  Ceratophyllum echinatum grew densely in a large cove on the lake’s eastern side and occurred in scattered locations around the lake. Potamogeton epihydrus, Potamogeton bicupulatus and Potamogeton pusillus were found in very shallow water north of the boat launch and in a cove on the western side of the lake.  Vallisneria americana was recorded in a cove at the northern end of the lake. In addition to submerged and floating-leaved species, two emergent species – a Sparganium sp. and an Eleocharis sp. – were collected.

Click here to link to our 2014 survey

Find Common Plant Names

(65 KB, .pdf format*)

Species recorded in our 2004 survey of Bashan Lake. Click on plant to view herbarium mount.(Invasive species in bold)

Myriophyllum heterophyllum

Ceratophyllum echinatum

Callitriche sp.

Potamogeton bicupulatus

Potamogeton epihydrus

Elodea nuttallii

Vallisneria americana

Najas flexilis

Utricularia macrorhiza (FKA vulgaris)

Utricularia purpurea

Utricularia gibba

Utricularia geminiscapa

Eleocharis sp.

Sparganium sp.

Eriocaulon aquaticum

Brasenia schreberi

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