Effects of Sewage Effluent on the Ecology of Swan Lake, Grand Teton National Park, Wyoming

Abstract

The study of the effects on the ecology of Swan Lake of the introduction of the effluent from the treatment plant handling sewage from the Colter Bay area was continued. The treatment plant was enlarged to include two additional sand filter traps which more than double its capacity. In contrast to 1958, at no time to my knowledge did any raw sewage go into the Lake without first passing through the sand filters. The week of July 23 was the first time that the new filters were put into use. Project Number 75.