Accession Number : ADA581112


Title :   Hole-in-the-Rock Backwater Excavation Missouri River Fish and Wildlife Mitigation Project, Thurston County, Nebraska, Missouri River Mile 706


Corporate Author : CORPS OF ENGINEERS OMAHA NE


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a581112.pdf


Report Date : Apr 2013


Pagination or Media Count : 51


Abstract : In accordance with the National Environmental Policy Act (NEPA) and implementing regulations, a Supplemental Environmental Assessment (EA) has been prepared for the proposed backwater renovation at Hole-in-the-Rock in Thurston County, Nebraska. The purpose of the proposed action is to repair damages that were sustained during the 2011 flood event. The original project was created to mitigate for aquatic and terrestrial habitat losses that resulted from implementation of the Missouri River Bank Stabilization and Navigation Project. The proposed action is necessary to restore function for the original backwater project. Three alternatives were considered for the renovation of the backwater at Hole-in-the-Rock. They include: restoring the entire backwater to a depth of approximately 5 feet below the August 50% exceedance profile, restore the backwater to its original constructed configuration which included two deep water overwintering holes for fish, and the No Action Alternative. Restoring the entire backwater to a depth of 5 feet below the August 50% exceedance profile was eliminated from further consideration because it would not provide adequate deep water habitat for over wintering fish. The Supplemental EA and comments received from the resource agencies were used to determine whether the proposed action would require the preparation of an Environmental Impact Statement. All environmental, social, and economic factors relevant to the proposal were considered in the Supplemental EA. No significant adverse impacts to these resources are expected to occur. In fact, the proposed project would restore the original habitat quantity and quality to provide increased benefits to resident and migratory fish and wildlife species. The proposed action will be in compliance with applicable environmental statutes.


Descriptors :   *CHANNELS(WATERWAYS) , *ENVIRONMENTAL ASSESSMENT , *EXCAVATION , *MISSOURI RIVER , DEEP WATER , ENVIRONMENTS , FISHES , HABITATS , NAVIGATION , POLICIES , QUANTITY , RESOURCES , WATER , WILDLIFE


Subject Categories : Ecology
      Hydrology, Limnology and Potamology


Distribution Statement : APPROVED FOR PUBLIC RELEASE