Lakes that are large (>10 acres), deep (> 18 feet), hard (alkalinity > 50 ppm), and drainage have both an inlet and outlet, and the main water source is from streams.
Muskgrasses (Chara spp.) are well-adapted to live in hard water drainage lakes and can often be found growing in dense mats along the lake bottom. These macroalgae play a valuable role in the lake's ecological community by preventing sediment re-suspension and helping to maintain clear water. Other common members of the submergent community in these lakes include cosmopolitan species such as coon-tail (Ceratophyllum demersum), common waterweed (Elodea canadensis), naiads (Najas spp.), and water celery (Vallisneria americana). Floating lilies (Nymphaea odorata and Nuphar variegata) are also common. Associated fish species vary depending on water depth and hydrology.
