Length:  118 Miles (including 5 miles in Canada)

Width:  Maximum 12 1/8 miles (average 4 1/8 miles)

Area:  490 square miles, of which 151 are in New York, 17 in Canada, 322 in Vermont; 423 sq. miles are water, 55 in islands.

Shoreline:  238 Miles in Vermont, 170 in New York

Elevation:  95 feet above sea level; has risen to a max. of 101.88 ft.(1993)

Discharge:  At Richelieu River, average of 2,992 gallons per second.

Drainage Area:  8,277 square miles

Depth:   Greatest depth is 399 ft., 2 miles north of Point Bay Marina.

Islands:  80

Freezes:  Average date of freeze over is February 7. In the last 150 years, the lake has failed to freeze over about 27 winters.

Access:  North through Richelieu Canal to the St. Lawrence River, Montreal through Quebec City; South through the Hudson Canal to New York City or the Erie Canal.