Lake Lillinonah /ˌlɪlɪˈnoʊnə/ is a manmade lake located in Fairfield, Litchfield and New Haven counties of Western Connecticut, approximately 60 miles (97 km) northeast of New York City.^[3] It is the second largest lake in Connecticut, smaller only than Candlewood Lake.^[3] The lake is bordered by six towns: Brookfield, Bridgewater, Newtown, New Milford, Roxbury, and Southbury.^[3] It was formed in 1955 by impoundment of the Housatonic River and the Shepaug River by the Shepaug Dam which was built by the Connecticut Light and Power Company.^[3] Some of the most expensive real estate in the Greater Danbury area is located on the shores of the lake, in the towns of Brookfield, Bridgewater and Newtown.

Lake Lillinonah
Lake Lillinonah near the Shepaug Dam, April 10, 2010
Lake Lillinonah Show map of Connecticut Lake Lillinonah Show map of the United States
Location	Fairfield, Litchfield and New Haven counties, Connecticut
Coordinates	41°28′08″N 73°18′43″W / 41.469°N 73.312°W / 41.469; -73.312
Type	Reservoir
Managing agency	Lake Lillinonah Authority, CL&P
First flooded	September 27, 1955 (1955-09-27)
Max. length	12 to 14 mi (19 to 23 km)
Surface area	1,547 to 1,900 acres (626 to 769 ha)
Max. depth	110 ft (34 m)
Shore length1	45 mi (72 km)
Surface elevation	59 m (194 ft)[1]
References	[2]
1 Shore length is not a well-defined measure.