Sylvan Lake, Watertown
(1.5 MB, .pdf format*)

   Sylvan Lake is a 9.1 acre water body located in a municipal park. The town maintains a swimming beach at the west end.

   Sylvan Lake is relatively shallow – nowhere more than 6.2 feet  deep (2 m) – and supported dense growth of aquatic plants across its extent during our September 2005 survey. Watershield (Brasenia schreberi) was the only floating-leaved species recorded, and it occurred only in small, scattered patches. Tapegrass ( Vallisneria Americana) and two Najas species were most abundant of the submerged plants. Vallisneria occurred along the west, north and east shores as well as in dense, scattered patches in deeper water. Arrowhead ( Sagittaria sp.) grew along the southern shore and in scattered areas in deeper water. Bushy pondweed (Najas flexilis) was most abundant on the southern half of the pond, while the invasive Najas minor was most abundant in the center and northern half of the pond. Curly leaf pondweed ( Potamogeton crispus), a second invasive species, was collected in one location in the center of the pond. Snailseed pondweed (Potamogeton bicupulatus) was found in several large patches both along the southern shore and in deeper water. A native milfoil (Myriophyllum humile) was found on the eastern and northern sides of the lake.

Find Common Plant Names

(65 KB, .pdf format*)


Species recorded in our 2005 survey of Sylvan Lake. Click on plant to view herbarium mount. (invasive species in bold)

Brasenia schreberi

Eleocharis sp.

Myriophyllum humile

Najas flexilis

Najas minor

Potamogeton bicupulatus

Potamogeton crispus

Sagittaria sp.

Vallisneria americana

*NOTE: Some of these documents are provided in Adobe® Acrobat® (.pdf) format. In order to view or print these documents you need Adobe® Reader®.  If you do not have Adobe® Reader®, click the "Get Adobe® Reader®" image for a free copy.

Get Adobe Reader