 In late 1960 , the Alaska Conservation Society became the first large conservation group to oppose construction of the dam . The organization believed the flooding of the Yukon Flats would cause critical damage to Alaska waterfowl and promoted the alternative Susitna Hydroelectric Project to supply Alaska 's electric needs . This was followed in early 1961 by an Alaska Sportsmen 's Council resolution that criticized the Corps of Engineers for reducing its funding for studies of the impact of the project on fish and game stocks . In April of that year , Alaska Sportsman magazine took a formal stand against the project . 
