Lake Hayward in East Haddam, CT was a resurvey from a survey done by CAES IAPP in 2005. It is a 172-acre lake with a maximum depth of 35 feet. The lake is bordered by roads and residential development on all sides with several beaches. There is public access to the lake by a state owned boat launch in the northern cove; however, gas motors are prohibited.

The CAES IAPP 2013 survey found 25 aquatic plant species. This is a slight increase to the 23 species that were found in 2005. Similar to the 2005 survey, the invasive species fanwort (Cabomba caroliniana) and variable-leaf watermilfoil (Myriophyllum heterophyllum) were present.

Fanwort was primarily located in the upper northern cove. The abundance in the northern cove appears to have increased since 2005. Besides the northern cove, only small patches consisting of singular plants of fanwort were found in different areas between 2005 and 2013.

Variable-Leaf watermilfoil was present only in the northern cove of the lake. Small patches were present on the western shore and a larger patch was along the eastern shore. This differs from the 2005 survey where variable-leaf watermilfoil was only found in two small patches along the middle western shore.

   The northern cove had the most vegetation present including yellow water lily (Nuphar variegata), watershield (Brasenia schreberi), white water lily (Nymphaea odorata), and pickerelweed (Pontederia cordata). Spikerush (Eleocharis species) was the most dominant plant and was present around much of the lake. Other species that were found in smaller patches throughout the lake include arrowhead (Sagittaria species), sevenangle pipewort (Eriocaulon aquaticum), humped bladderwort (Utricularia gibba), and purple bladderwort (Utricularia purpurea).