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Missouri River Gavins Point Dam Degradation Trends Study

US Army Corps of Engineers

This report evaluates degradation trends of a study reach downstream of Gavins Point Dam. Basic pertinent data collected on various hydraulic and geomorphic elements and channel characteristics collected after the construction of the Gavins Point Dam are presented and evaluated. This volume will serve as a permanent record of most of the basic observations.

Results Of A Biological Survey For Leptodea Leptodoll (Rafinesque, 1820) In The Missouri River In Southeastern South Dakota, Arthur H. Clarke

US Army Corps of Engineers

In late September and early October, 1995, a brail survey was carried out to determine the distribution of Leptodea leptodon (Rafinesque) in the Missouri River near Yankton and Vermillion, South Dakota. We did not find L. leptodon but useful information in three areas was nevertheless brought to light, viz. :

(1) Leptodea leptodon is unusual in that adults are deeply buried and are not available by brail. Subsequent investigations which seek to determine its abundance at its only known location in the research area, close below Gavin's Point Dam, can only be carried out with the help of a diver …