Geneva Lake Facts
Area: 5500 square acres (8.6 square miles)
Length: 9 miles
Greatest width: 3 miles
Narrowest width: ½ mile
Deepest point: 152 feet (off black point)
Average approximate surface water temperature: *
June 1: 65°
July 1: 74°
August 1: 82°
Waves: Since Geneva Lake is a long lake stretching from east to west,
waves are at their greatest heights and force when there is a strong wind blowing from the east or west.
Geneva Lake is calm on some days, while on some rare days there are waves as high
as 5 feet or more. Of course the size of the waves is also influenced by "boat chop" created by boat wakes.
* Temperatures are taken at three feet below the surface at Water Safety Patrol H.Q.(between Williams Bay and Fontana) in Lake Geneva and averaged over the years
beginning with 1991. Surface temperatures often fluctuate by 1° to 6° depending on the location on the lake
(temperatures are generally a bit cooler on the west end of the lake near Fontana).