Coventry Lake, also known as Wangumbaug Lake, is a 373-acre body of water used for recreation. It is heavily developed with summer cottages and permanent homes, and not much is done to buffer the transition between lawns and the water. The shoreline is home to diverse aquatic plant life, but the abundance of vegetation declines quickly as the bottom rapidly slopes to an average depth of seven meters (21 feet). Public access is via State boat launch at the south end and a beach on the north end.

Our July of 2008 survey found the invasive species Eurasian watermilfoil (Myriophyllum spicatum) and curlyleaf pondweed (Potamogeton crispus) in relatively small quantities as well as 16 native species. Eurasian watermilfoil was concentrated in medium sized patches near the shore with the largest of the patches near the small boat launch and docks located near the middle of the western shore. Other patches occur more to the north on the same eastern shore and in smaller quantities toward the northwest. Curlyleaf pondweed is an invasive that occurs in even smaller quantities like right near the output of a storm pipe on the southwestern shore. The most abundant plant in Coventry Lake is water stargrass (Zosterella dubia) which can be found in most shallow areas except for the rockiest shores. In most places it is found mixed with one or several of the diverse array of plants listed below. The second most common plant is eelgrass (Vallisneria americana) which is in some cases found with water stargrass. The most diversity in plant life is concentrated along the western stretches of shore where more houses and private docks are present.