Projects & Studies
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Critical Infrastructure Security Program (CISP)
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Dam Bridge and Gate Painting: Upper St. Anthony Falls through Lock and Dam 10
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East Two Rivers at Tower, Minnesota
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Effects of Recreational Boating on the Upper Mississippi River System
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General Investigations: Federal Energy Regulatory Commission(FERC) Licensing
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General Investigations: Hydropower, Crown Hydro, Minneapolis, Minnesota
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General Investigations: Hydropower, Ford Plant, Minneapolis, Minnesota
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Hydropower, LSAF Hydro, Minneapolis, Minnesota
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Hydropower, Lock and Dam 2, Hastings, Minnesota
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Hydropower, Upper St. Anthony Falls, Minneapolis, Minnesota
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Integrated Watershed Study: Minnesota River Basin in Minnesota, South Dakota, North Dakota and Iowa
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Lock & Dam 10 Stage 2
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Lock Tow Haulage Units
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Lock and Dam 4 Embankment Environmental Assessment
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Locks and Dams 2 - 10, Embankment Maintenance Study
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Lower Pool 4 Channel and Dredged Material Management Study
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McMillan Island, Mississippi River Channel Maintenance
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Minnesota River Navigation Project
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Mississippi Headwaters Reservoirs Dam Safety Issues
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Mississippi Headwaters Reservoirs Project Sites
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Mississippi River Locks and Dams Nos. 2-10 Embankment Rehabilitation
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Mississippi River Major Maintenance / Rehabilitation
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Mississippi River: Lock & Dam 3 Navigation Safety and Embankments, Minnesota and Wisconsin
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Navigation and Environmental Sustainability Program (NESP)
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Navigation, Mississippi River, Lock Bulkheads and Slot Installation, Minn/Wisc/Iowa
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Operation and Maintenance, Lock and Dam 10 Stage 2
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Reconnaissance Study: Minnesota River Basin in MN, SD, IA and ND
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Recreational Boating Study of the Mississippi River, Pools 4 to 9, Summer 2003
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River Resource Values and Expectation
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Small-Boat Harbor Dredging, St. Paul, Minnesota (Harbor Dredging)
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St. Croix River: Endangered Mussel Conservation - Zebra Mussel Control
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Upper Mississippi River - Illinois Waterway System Navigation Study
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Upper Mississippi River 9-Foot Project - Locks & Dams
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Upper Mississippi River 9-Foot Project Channel Maintenance; MN, WI, IA
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Warroad Harbor and River Harbor Dredging
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Locks and Dams 2 - 10, Embankment Maintenance Study
Location/Description
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An earthfill embankment dam is included in each of the Mississippi River locks and dams 2 through 10. At Lock and Dam 3, only embankments on the Minnesota side are included in this project.
The purpose of the project is to extend the useful life of the embankments considering the potential for high floods, degradation of the ripra, and presence of seepage and tree growth at the downstream toe of some of the embankments. Because the embankments are a sandfill type, the potential exists for damage from erosion, especially during high water. The existing rock erosion protection is past its intended design life and does not perform satisfactorily.
The primary result of an embankment failure would be the loss of the 9-foot navigation channel, with adverse effects on the river environment and navigation.
Evaluation of the existing conditions will include restoring embankments to meet design standards where needed, collecting geotechnical data for use in analysis and presenting it in a usable form for future reference, performing embankment stability analysis, determining upstream riprap deterioration, determining erosion protection for wave action, determining embankment-structure junction protection, and developing a comprehensive plan to improve conditions that will achieve environmental sustainability. No increase in the height of the embankments is planned.
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Status
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Wave action from high water in the spring of 2001 caused widespread erosion, and the Corps of Engineers had to complete $2.3 million of emergency repair work, consisting of rock placement on the upstream slope of selected reaches of embankments at Locks and Dams 2, 5 and 8.
Additionally, Corps' and other government personnel visually inspected the existing embankments for each site and identified three sites that need repair within the next five years as a result of the 2001 event.
The repair work consists of rock placement on the upstream and downstream slopes of selected reaches of embankments at Locks and Dams 5A, 6 and 8. Construction work for Lock and Dam 6 is complete. Construction for Lock and Dam 8 is underway and should be completed by September 2006. Construction work for Lock and Dam 5A is scheduled to start in 2007 and be completed by September 2007. Any remaining maintenance work on the embankments will be part of a comprehensive plan developed by an interagency team.
The interagency team will also interact with the Upper Mississippi River System Navigation and Environmental Sustainability Program. The entire work effort is being coordinated with the Upper Mississippi River Resources Forum.
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Planning and design took place in fiscal year 2006 on a demonstration project at Lock and Dam 4. Construction is planned to start in fiscal year 2007 and will take one to two years. A sand berm will be constructed to act as erosion protection for the embankment rather than placing riprap. The purpose of the plan is to create more beneficial habitat than currently exists. Design for riprap overtopping erosion protection on the embankment at structures started in fiscal year 2006. Construction is to be completed in 2010 at an estimated cost of $6 million. Design for remaining erosion protection on the embankments will start in fiscal year 2009, and construction is to be completed by fiscal year 2021 at an estimated cost of $24 million.
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Authority
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The Upper Mississippi River Nine-Foot Channel Navigation Project was authorized as part of the River and Harbor Act approved July 3, 1930.
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Fiscal
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Lock and Dam 5A work is estimated to cost about $250-500,000 in fiscal year 2007. Lock and Dam 4 work is estimated to cost about $1 million in fiscal year 2007 and $200,000 in 2008. Cost for the remaining embankment rehabilitation work is estimated to be $30 million.
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[Printable Copy]
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