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Grannis Lake, East Haven - 2004


2004 Aquatic Plant Survey Map of Graniss Lake

(1.5 MB, .pdf format*)

Transect Data (269 KB, .pdf format*) | Water Data

   Graniss Lake is located in East Haven between a road and a highly developed area, with little to no plant buffer around the lake.  Graniss Lake is part of a Connecticut Agricultural Experiment Station study on the control of aquatic vegetation, which required more transects. 

   The west side of this approximately 20-acre lake was dominated by Stuckenia pectinata, which was in flower during a mid-July survey in 2004.  The east side of the lake was dominated by the invasive Potamogeton crispus, which was dying back and producing many turions. Both S. pectinata and P. crispus were lush and reached the surface in as much as eight feet of water.

   Shallow water near the shore of the small lake supported many plants of Nymphaea odorata, which also occurred in occasional patches of Nuphar variegata.  Isolated plants of Myriophyllum spicatum also were observed. Myriophyllum had been abundant the year before, when two herbicide treatments were administered. A patch of Potamogeton pusillus was recorded in a cove to the northeast of a small island just off the northern shore.

Other Grannis Lake Surveys: 2011 Survey

Find Common Plant Names

(65 KB, .pdf format*)

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

Ceratophyllum demersum

Myriophyllum spicatum

Nuphar variegata

Nymphaea odorata

Potamogeton crispus

Potamogeton pusillus

Stuckenia pectinata

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