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Title: Final Individual Environmental Report Supplemental, Improved Protection on the Inner Harbor Navigation Canal, Orleans and St. Bernard Parishes, IERS #11 - Tier 2 Borgne Supplemental
Authors: United States. Army. Corps of Engineers. New Orleans District
Keywords: Pontchartrain, Lake (La.)
Flood control
Environmental management
Inner Harbor Navigation Canal (La.)
Publisher: United States. Army. Corps of Engineers. New Orleans District.
Abstract: The U.S. Army Corps of Engineers, Mississippi Valley Division, New Orleans District , has prepared this Individual Environmental Report #11 Tier 2 Borgne Supplemental (IER #11 Tier 2 Borgne Supplemental) to evaluate the potential impacts associated with proposed project revisions to the original IER #11 Tier 2 Borgne. On October 21, 2008, the District Commander signed the Decision Record for IER #11 Tier 2 Borgne. IER #11 Tier 2 Borgne is hereby incorporated by reference into this supplemental document. Copies of the document and other supporting information are available upon request or at This supplemental document has been prepared to address proposed changes in the Government’s approved plan. IER #11 Tier 2 Borgne proposed construction of this project in two phases. The first phase, called “advance measures” was originally scheduled for completion by June 2009. These advance measures would have provided some level of flood protection prior to the 2009 hurricane season. The intent was to have the GIWW bypass swing gate, a cofferdam across the footprint of the GIWW sector gate, and a cofferdam at Bayou Bienvenue in place, and completion of the floodwall across the marsh and MRGO to a height of +20.75 feet. Project delays in addressing navigation industry concerns, and other factors impacted the start of project construction. This delay precluded the achievement of advance measures by June 2009. As such, the construction sequencing has been modified from that discussed in the October 21, 2008 Decision Record. The current construction schedule anticipates completion of the floodwall across the marsh and MRGO to a height of 14.75 feet by December 2009. Additionally, a cofferdam around the footprint of the GIWW barge gate is expected by August 2010, and the floodwall parapet (to a height of +24 feet) is anticipated to be complete by October 2010.
Description: Individual Environmental Impact Supplemental
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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