Glacial Lake Connecticut formed over what is now Long Island Sound and coastal Connecticut at the fore edge of the ice sheet of the Wisconsin glaciation, as the lobe of the Laurentide Ice Sheet began to retreat, some 18 to 20,000 years before present.
The fore-edge lake formed by glacial meltwater expanded to be about the same size as present-day Long Island Sound; it may have been connected at times with similar freshwater lakes in Block Island Sound and Buzzards Bay, while sea level was low.
The fairly shallow average depth of 78 feet (24 m) of today's Long Island Sound is the result of fine lake-bottom sediments deposited as glacial outwash slowed in Lake Connecticut.
Suspended as rock flour, the fine sediments would have rendered Lake Connecticut a turquoise blue-green.
The end of Lake Connecticut was marked by a series of intervals of salt water incursion after about 15,000 BP and subsequent refreshening, as rising sea levels and isostatic rebound of land depressed by the former weight of ice sheets adjusted to one another.