Lake Hammonasset, Madison


2004 Aquatic Plant Survey Map of Lake Hammonasset

(1.5 MB, .pdf format*)

Transect Data (206 KB, .pdf format*)  | Water Data

   Aquatic plants were extremely sparse at the time of an August 2004 survey of 243-acre Lake Hammonasset, apparently as a result of the lowering of the water level in the lake.  (Lake Hammonasset is owned by the South Central Connecticut Regional Water Authority and managed as a drinking water reservoir.)  The water appeared to be about 8 feet below normal, which left large areas of what would have been shallow-water habitat exposed.


   Individual plants to very small patches of Utricularia radiata, Ceratophyllum echinatum, Nymphoides cordata and Potamogeton bicupulatus were found on the western side of the lake’s northern finger of water. Only Utricularia radiata and Nymphoides cordata were found on the eastern side.

   An unidentified sedge was recorded near a stream entering the lake on the northern end and somewhat farther south on the shore. The species also was found in a few small patches in the main body of the lake.  A few plants of Utricularia radiata also were found in the southeastern part of the lake’s main body.

Find Common Plant Names

(65 KB, .pdf format*)

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

Ceratophyllum echinatum

Gratiola aurea

Nymphoides cordata

Potamogeton bicupulatus

Unidentified sedge

Utricularia intermedia

Utricularia radiata

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