Lake Waramaug, as seen from Lake Waramaug State Park
LAKE WARAMAUG Latitude and Longitude:
|Primary inflows||Sucker Brook (Lake Waramaug Brook), groundwater|
|Primary outflows||East Aspetuck River|
|Surface area||656 acres (265 ha)|
Lake Waramaug is a 656-acre (265 ha) lake occupying parts of the towns of Warren and Washington in Litchfield County, Connecticut,  approximately 24 miles (39 km) north of Danbury. The lake is named after Chief Waramaug, who wintered in the area surrounding Lake Waramaug. 
Although natural in origin, the surface elevation of the lake has been raised by a small concrete and masonry dam. The surface area of the lake is approximately 680 acres (2.8 km2). The lake has a maximum depth of 40 feet (12 m), an average depth of 22 feet (7 m), and contains approximately 4.8 billion US gallons (18,000,000 m3) of water. The lake is fed by Sucker Brook (Lake Waramaug Brook), numerous small streams, and groundwater that enters through the lake bottom. Drainage from Waramaug Lake flows southward into the East Aspetuck River.
The bottom materials on steep side slopes of the lake consist primarily of gravel, cobbles, and boulders, whereas the flatter areas consist primarily of sand, mud, and organic muck. The watershed of the lake is 14.4 square miles (9,216 acres (37 km2)). Approximately 74 percent (6,820 acres (28 km2)) of the watershed is forested. Wetlands and water bodies comprise approximately 10 percent (922 acres (3.7 km2)) of the watershed, while the remaining 16 percent (1,474 acres (6 km2)) of the area is low-density residential housing and commercial and agricultural land.
The shoreline development of Lake Waramaug is moderate and includes houses, seasonal cottages, and boat houses, with few commercial establishments. Public access to the lake is available only within Lake Waramaug State Park, which is located at the northwestern end of the lake. Outside park boundaries, the shoreline is privately owned . The park can be reached by taking Route 45 north from Route 202 and turning west onto North Shore Road.
An aquatic survey of Waramaug Lake was published in 1987. The survey found aquatic vegetation to be relatively sparse, with only localized growths of emergent and submergent species along the shorelines and shallows of the lake. Aquatic species observed include Robbins pondweed ( Potamogeton robbinsii), coontail ( Ceratophyllum demersum), white-water lily ( Nymphaea odorata), narrow-leaved arrowhead ( Sagittaria graminea), yellow-pond lily ( Nuphar variegatum), spike rush (Eleocharis sp.), bushy pondweed ( Najas flexilis), leafy pondweed ( Potamogeton foliosus) and pondweed ( Potamogeton gramineus).
In 2004, the Town of Washington entered into an agreement with the Connecticut Department of Environmental Protection to reconstruct and expand the town's boat launch at Lake Waramaug, and to permit 20 launchings per day by non-residents in exchange for the DEP agreeing not to construct a new boat launch at Lake Waramaug State Park. The agreement limits motor boat traffic on the lake, and requires inspection of all boats for invasive aquatic plant species prior to launching.  Plans for the new boat launch were developed in 2006,  and the new facility was opened in 2008.  In 2010, the Town of Washington separately completed major reconstruction of the adjacent, hitherto forlorn town beach at Lake Waramaug, which may be used only by Washington residents and their guests. New parking areas were constructed, new fencing and landscaping were installed, and a new boathouse with a caretaker's apartment was constructed. 
|Wikimedia Commons has media related to Lake Waramaug.|
- "Waramaug Lake (2 of 2)" (PDF). Connecticut Department of Energy and Environmental Protection. September 2011. Archived from the original (PDF) on June 26, 2015. Retrieved June 25, 2015.
- Pietrzyk, Cindi D. (16 April 2013). Connecticut Off the Beaten Path, 9th: A Guide to Unique Places. GPP Travel. p. 93. ISBN 978-0-7627-8637-4.
- "Recreation". Lake Waramaug Association. Retrieved 8 May 2013.
- Compton, Ann (2006-11-18). "Waramaug Boat Launch Project Plans Unveiled". Voices. Prime Publishers, Inc. Archived from the original on 16 June 2012. Retrieved 8 May 2013.
- "CT DEP and Town of Washington Announce Opening of Lake Waramaug Town Boat Launch in Washington" (Press release). Connecticut Department of Energy and Environmental Protection. August 4, 2008. Retrieved 8 May 2013.
- Compton, Ann (2009-07-22). "Wetlands Approves Application for Cottage at Town Beach". Voices. Prime Publishers, Inc. Archived from the original on 16 June 2012. Retrieved 8 May 2013.
- Connecticut DEP, 1999, Connecticut Angler's Guide.
- Connecticut DEP, 1999, Connecticut Boating Safety Enforcement Manual 1999 - Statutes and Regulations.
- An Electrofishing Survey of Selected Connecticut Lakes. Jacobs, R.P. and O'Donnell, E.B., 1996,
- State Board of Fisheries and Game, 1959, A Fishery Survey of the Lakes and Ponds of Connecticut.