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Title: Supplemental Environmental Assessment & Finding of No Significant Impact : Middle Decatur Bend-Phase III, Monona County, Iowa
Authors: United States. Army. Corps of Engineers. Omaha District
Keywords: Monona County (Iowa)
Missouri River
Stream restoration
Environmental protection
Environmental management
Publisher: United States. Army. Corps of Engineers. Omaha District.
Abstract: The purpose of the proposed project is to correct damages to Water Control Structure (WSC) 10 caused by the precipitation events and exacerbated by the existing scour hole from the 2011 flood. These repairs are needed because WSC10 has been flanked and no longer controls the upstream lake levels of Decatur Bend Lake. High flows now sweep around WSC10 in a southerly direction instead of in a westerly direction towards the Missouri River. An area of cut bank erosion was noted downstream of WSC10 near Dike 739.75 with concern for potential damage to the dike. Widening of the backwater channel downstream of WSC10 was also noted. These repairs will restore the intended habitat function of the originally designed project and prevent it from degrading further as well as reduce the threat of potential damage to Dike 739.75. These repairs will enable the ability to manipulate the water elevation of the upstream Decatur Bend Lake and prevent further widening of the downstream backwater channel.
Description: Supplemental Environmental Assessment and Finding of No Significant Impact
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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