Surveys for anthropophilic mosquitoes conducted over a 30-year period in proximity of beaver ponds in 3 research sites in Otsego County, New York, indicate that none of the ponds seemed to support significant populations of permanent water mosquitoes. The only site sampled before impoundment previously had supported large populations of Aedes punctor and Aedes stimulans and lesser numbers of other "northern Aedes"-type anthropophilic species.