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Tag: Mississippi River
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  • March

    Disposition Study, Lower St. Anthony Falls Lock and Dam, and Lock and Dam 1, Upper Mississippi

    A Section 216 study will investigate the appropriate future disposition of Lower St. Anthony Falls (LSAF) Lock and Dam and Lock and Dam 1, located on the Mississippi River in Minneapolis, Minnesota. The LSAF Lock and Dam was constructed as part of the Minneapolis Upper Harbor project in 1956 as authorized by the Rivers and Harbors Act of 1937. Lock and Dam 1 was originally constructed in 1917 and was modified in 1932 under the authority of the River and Harbor Act of 1930. The U.S. Army Corps of Engineers operates and maintains the two sites. Both locks have been affected by the decrease in the demand for navigation services stemming from the closure of Upper St. Anthony Falls Lock and Dam on June 9, 2015. This disposition study will examine the benefits and costs of continuing to operate LSAF and Lock and Dam 1.
  • Mississippi River Locks and Dams 2–10 Non-Structural Embankment Repair

    Non-structural embankment repair projects at Locks and Dams 2 through 10 will address restoring embankments to meet current design standards. Most dam embankments are currently protected from the erosive forces of water by a layer of riprap placed along the embankment’s length. When the riprap eventually erodes, the embankment itself will erode if more protection is not added. The U.S. Army Corps of Engineers has designed and placed berms and small islands to assist in reducing wave action and wind fetch within pools created by the locks and dams. Reducing these forces increases the longevity of the embankment protections.
  • Upper Mississippi River Restoration Program: Reno Bottoms

    Much of the floodplain forest in the Reno Bottoms project area has been declining in coverage over the past several decades. Current Pool 9 water management and flow through the Lock and Dam 8 embankment have shifted the floodplain forest distribution to higher elevations than pre-impoundment conditions. Without active management, floodplain forest in the Reno Bottoms project area is likely to continue to degrade. The proposed project goals include protecting, maintaining and restoring floodplain hardwood forests to levels that are sustainable. The 14,000 acre Reno Bottoms area is located within the Upper Mississippi River National Wildlife and Fish Refuge in Houston County, Minnesota and Allamakee County, Iowa and is in Pool 9 between river miles 671‒682.
  • October

    Mississippi River Lock and Dam 5A Embankment and Levee Certification

    The Lock and Dam 5A embankment is located along the Mississippi River about 3.5 river miles above Winona, Minnesota, and about 3 river miles below Fountain City, Wis. FEMA is verifying that all levees recognized as providing protection from the base flood meet the requirements outlined in 44 CFR 65.10. This code requires that specific structural requirements must be certified by a registered professional engineer or a federal agency with responsibility for levee design. The City of Winona is performing this certification for the flood risk management project with the Corps providing an analysis of the Lock and Dam 5A embankment in support of that certification.
  • March

    Dredged Material Management Plan (DMMP): Pool 9

    The Pool 9 Dredged Material Management Plan (DMMP) study area is located between Lock and Dam 8 at Genoa, Wisconins, and Lock and Dam 9 near Lynxville, Wisconsin, spanning more than 31 river miles from 679.2 to 648.0. The purpose of the DMMP is to prepare, a coordinated long-term plan for managing dredged material in Pool 9 of the Upper Mississippi River for the purposes of continued operation and maintenance of the Upper Mississippi River 9-Foot Channel Navigation Project.