Lake Geneva to swim at some beaches of the lake; indeed, visibility under water was near zero. By the 1980s, intense environmental pollution (eutrophication) had almost wiped out all the fish. Today, pollution levels have been dramatically cut back, and it is again considered safe to swim in the lake. Major leisure activities practiced include sailing, wind surfing, boating (including water skiing and wakeboarding), rowing, scuba diving and bathing. On a scientific footnote, in 1827, Lake Geneva was the site for the first measurement of the speed of sound in (fresh) water. French mathematician Jacques Charles François Sturm and Swiss Physicist Daniel
French Lake, California Lake for post-California Gold Rush hydraulic mining. French Lake, California French Lake, California (), located in Nevada County, was a California Gold Rush community, now uninhabited. It was located by a lake of the same name. French Lake Reservoir, at an elevation of 7500’-6680’, is part of a string of lakes, including Bowman Lake, Sawmill Lake, and Faucherie Lake to the northwest, as well as Meadow Lake and Fordyce Lake to the southeast. French Lake Road, used by the Nevada Irrigation District and not available for public use, skirts the lake's northwest perimeter before heading east to Meadow Lake Road.