Alexander Lake, Killingly


Aquatic Plant Survey Map of Alexander Lake

Transect Data | Water Data

   Alexander Lake is 215-acres with an average depth of the lake is 25 feet, and the maximum is 51 feet.  The lake has a sandy bottom and the shoreline is developed with mainly small residences. A few of the resident lawns extend to the edge of the lake, however, most homes have trees and shrubs as a buffer between the lawn and the water. There is no public access to the lake. Small boats can use a private right-of-way on the southeast shore and only small (<10 horsepower) motors are allowed.

   Our July 2005 survey, found the water to be uncommonly clear with a Secchi measurement of 5.8 m (18 feet). Aquatic plants were frequent in shallow water and extended into water at least 4 m (15 feet) deep. The most abundant plants were all small, low-growing species. Large-bodied plants, including floating-leaved species, were absent or limited to small coves. The most abundant plant was Eleocharis acicularisEriocaulon aquaticum occurred with Eleocharis acicularis in the shallowest water along the edge of the lake. Commonly occurring with them were Elatine minima, Gratiola aurea and Sagittaria sp.  Glossostigma cleistanthum was very abundant in a number of areas and occurred all around the lake, forming very dense stands in water up to 2 m (6 feet) deep.  Najas guadalupensis was also frequently found in abundance in the shallow areas of the lake.

   Other species, such as Potamogeton epihydrus, Potamogeton pusillus , Utricularia vulgaris, Isoëtes acadiensis, Myriophyllum humile, Myriophyllum tenellum, and Charaphyte algae, occurred in mostly small patches in various places around the lake.  Potamogeton bicupulatus and Vallisneria americana were the most frequently found.  The floating-leaved species Nuphar variegata and Nymphaea odorata occurred in a small cove in the southeast part of the lake.   Nuphar variegata was also found in a cove at the lake’s northeast corner.  Another floating leaved species, Brasenia schreberi was found to be the dominant species in a cove on the east side of the lake.   This is one of the few lakes where we have found Lobelia dortmanna. 

Species recorded in our 2005 survey of Alexander Lake.
Click on plant to view herbarium mount.
Scientific Names
*Invasive Species

Acadian Quillwort

Ribbonleaf Pondweed


Sevenangle Pipewort

Common Bladderwort

Slender Watermilfoil

Dortmann's Cardinalflower

Small Pondweed
White Water Lily 

Golden Hedge-Hyssop

Snailseed Pondweed
Yellow Water Lily

Low Watermilfoil

Southern Naiad