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Title: Mobile Harbor, Mobile, Alabama: Integrated General Reevaluation Report With Supplemental Environmental Impact Statement
Authors: United States. Army. Corps of Engineers. Mobile District.
Keywords: Mobile Bay (Ala.)
Environmental management
Publisher: United States. Army. Corps of Engineers. Mobile District.
Abstract: The study area encompasses Mobile Bay, Alabama which is bounded by the Morgan Peninsula to the east and Dauphin Island, a barrier island to the west. Mobile Bay is triangularly shaped with an area of approximately 413 square miles. At its largest dimensions it is 31 miles long and 24 miles wide. The deepest areas, 50 feet (ft), are located within the Federal navigation channel, which serves Alabama’s only port for ocean‐going vessels. The Mobile Bay Watershed is the sixth largest river basin in the U.S. The study evaluated a range of alternative plans that would improve the safety and efficiency of the existing navigation system. The principal navigation problem is larger vessels are experiencing transportation delays and inefficiencies due to limited channel depth and width. The Recommended Plan includes the following navigation improvements: 1) deepen the existing Bar, Bay, and River Channels by 5 ft to project depths of 52, 50, and 50 ft, respectively, including an additional 2 ft for advanced maintenance plus 2 ft of allowable overdepth; 2) incorporate bend easings in the Bar Channel; 3) widen the Bay Channel from 400 feet to 500 ft for 3 nautical miles to provide a two-way traffic area for passing; and 4) expand the Choctaw Pass Turning Basin 250 ft to the south to better accommodate safe turning of the design vessel and other large vessels. Placement areas for the new work material include the Relic Shell Mined Area, Sand Island Beneficial Use Area (SIBUA) if suitable material is identified, and the Ocean Dredged Material Disposal Site (ODMDS). Placement areas for future maintenance will remain unchanged with the exception of proposed extensions to the SIBUA and the ODMDS. The recommended plan is economically justified with a benefit-to-cost ratio (BCR) of 3.1. The project costs are estimated to be $365.7 million.
Description: General Reevaluation Report and Supplemental Environmental Impact Statement
Rights: Approved for Public Release; Distribution is Unlimited
Size: 345 pages / 15.06 Mb
Types of Materials: PDF/A
Appears in Collections:Environmental Documents

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