Higganum Reservoir, Haddam


2004 Aquatic Plant Survey of Higganum Reservoir

(1.5 MB, .pdf format*)

Transect Data (224 KB, .pdf format*) | Water Data

The Higganum Reservoir in Haddam reaches a maximum depth of 34 feet near the dam built on the northern end. Houses have been built along much of the eastern side of the reservoir and along the north end of the western side. Only four aquatic plant species were recorded in Higganum Reservoir in July 2004, several months after a dam-replacement project was finished and the reservoir was refilled. The 30.8-acre reservoir had been drained three years earlier, when an earlier dam was declared unsafe.


Polygonum amphibium (water smartweed) was the most abundant plant in July 2004, occurring in scattered patches in water less than 6 feet deep at the pond’s southern end. Three other plants, also found in shallow water in the southern part of the pond, were Utricularia geminiscapa (hiddenfruit bladderwort), Brasenia schreberi (watershield) and Potamogeton spirillus (spiral pondweed).  The patches of Polygonum amphibium were scattered along the eastern and western shores. Brasenia schreberi and Potamogeton spirillus were found along the eastern shore, and Utricularia geminiscapa was recorded near an unimproved state boat ramp on the western shore.

Three additional aquatic plant species, Nuphar variegata (yellow water lily), Nymphaea odorata (white water lily) and Najas flexilis (slender naiad), were recorded during a brief survey in September 2004. Only a few plants of each species were found, all occurring in the southern part of the reservoir.

Find Common Plant Names

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

Brasenia schreberi

Najas flexilis

Nuphar variegata

Nymphaea odorata

Polygonum amphibium

Potamogeton spirillus

Utricularia geminiscapa

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