Iowa law (1950) prescribes no permanent dam or obstruction shall be erected or maintained which is not provided with a fishway, except by written approval of the State Conservation director. This law has been in effect for many years. The purpose of this act of the legislature was to provide free passage of fishes in the inland rivers of the State. It is not the purpose of this paper to discuss the need for fishways, but rather to present some of the data collected in testing the efficiency of a fishway design considered most practical for low-head dams for this State. The fishway upon which these data were gathered is a modified form of the Denil type first developed in Belgium.
Proceedings of the Iowa Academy of Science
©1950 Iowa Academy of Science, Inc.
Harrison, Harry M. and Speaker, Everett B.
"Further Studies of the Modified Denil Fishway in the Des Moines River,"
Proceedings of the Iowa Academy of Science, 57(1), 449-456.
Available at: https://scholarworks.uni.edu/pias/vol57/iss1/63