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Title: Environmental Assessment : Dredged Material Placement, 21st Avenue West Channel Embayment, Duluth, Minnesota
Authors: United States. Army. Corps of Engineers. Detroit District.
Keywords: Duluth (Minn.)
Dredging spoil
Stream restoration
Environmental management
Environmental protection
Publisher: United States. Army. Corps of Engineers. Detroit District.
Abstract: The U.S. Army Corps of Engineers Detroit District proposes to place limited quantities of dredged material from maintenance dredging of the Federal navigation project at Duluth-Superior Harbor into the embayment of the 21st Avenue West Channel in Duluth, Minnesota. This will allow for evaluation of using dredged material from maintenance dredging of the harbor for aquatic habitat restoration. The 21st Avenue West Channel site is within the Duluth-Superior Harbor, which is located at the western end of Lake Superior between Duluth, Minnesota, and Superior, Wisconsin. The harbor is at the mouth of the St. Louis River, which is the second largest tributary of Lake Superior. The lower reaches of the St. Louis River are lacking vibrant submergent and emergent wetlands, which are important to the overall biological and ecological diversity of the St. Louis River estuary. Upstream parts of the estuary support a diverse ecosystem of national significance, providing habitat for many native fish species and native bird species, including songbirds, raptors, shorebirds, waterfowl, gulls and terns. The proposed dredged material placement will help in determining the feasibility of full scale aquatic ecosystem restoration and help towards delisting the site from being part of a contaminant area of concern (AOC)1. Results will be useful in developing future restoration plans at the 21st Avenue West Channel site and other sites around the estuary for purposes of habitat restoration to provide aquatic macrophyte habitat areas, shoreline softening, mid-water shoals/islands, and partial filling of deep holes, as well as for delisting of areas from the AOC.
Description: Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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