Active Levee Projects
Levee Underseepage Control Project Improvement (Geotechnical MC_1)
DESIGN UNDERWAY
The project will add underseepage control features including a seepage berm and pervious trench with collector pipe.
Levee Underseepage Control Project Improvement (Geotechnical MC_2)
DESIGN UNDERWAY
The project will add a seepage berm underseepage control feature.
Levee Maintenance Project Improvement (Freeboard IC_1)
CONSTRUCTION UNDERWAY
The project will address maintenance needs in the upper Indian Creek reach.
Completed Levee Projects
Levee Alignment A Accreditation
COMPLETED IN 2022
After required maintenance projects were completed, levee certification data and documentation was developed for a segment of the Missouri River levee system starting at Big Lake Park and running west and south to the Western Historic Trails Center (south of Interstate 80). The documentation was provided to Federal Emergency Management Agency (FEMA) which is responsible for flood hazard mapping. On future FEMA Flood Insurance Rate Maps (FIRMs), this segment of levee will be officially documented as accredited. Documentation for other segments of levee in Council Bluffs will be coordinated with FEMA once construction of necessary improvements is complete.
Levee Underseepage Control Project Improvement (Geotechnical MR_3)
COMPLETED IN 2022
The project decommissioned 12 relief wells and replaced them with a sand seepage berm measuring approximately 3,500 feet in length and ranging in width from 150 feet to 300 feet. The sand berm was partially constructed utilizing existing sand berm material on-site placed during the 2011 flood. Over 65,000 cubic yards of additional sand for the project was sourced from material dredged from Lake Manawa.
Levee Underseepage Control Project Improvement (Geotechnical MR_4)
COMPLETED IN 2022
The project decommissioned 10 relief wells and replaced them with a sand seepage berm measuring approximately 4,700 feet in length and 400-feet in width. The sand berm was partially constructed utilizing existing sand berm material on-site placed during the 2011 flood. Over 375,000 cubic yards of additional sand for the project was sourced from material dredged from Lake Manawa.
Levee Underseepage Control Project Improvement (Geotechnical MR_6)
COMPLETED IN 2026
The project decommissioned 21 relief wells and 4 piezometers and replaced them with a sand seepage berm measuring approximately 7,200 feet in length and ranging from 150 to 400 -feet in width. Site drainage piping and 4 new relief wells were added where necessary. The sand seepage berm was partially constructed utilizing existing sand berm material on-site placed during the 2011 flood.
Levee Underseepage Control Project Improvement (Geotechnical MR_8)
COMPLETED IN 2024
The project decommissioned 5 original relief wells and replaced them with a sand seepage berm measuring approximately 2,500 feet in length and 150 feet in width.
Levee Underseepage Control Project Improvement (Geotechnical MR_9)
COMPLETED IN 2024
The project decommissioned 5 relief wells and 4 piezometers and replaced them with a sand seepage berm measuring approximately 1,700 feet in length and ranging from 150 to 225-feet in width. The sand berm was partially constructed utilizing existing sand berm material on-site placed during the 2011 flood. Out of service drainage structures were also decommissioned and removed from the levee.
Levee Underseepage Control Project Improvement (Geotechnical MR_5)
COMPLETED IN 2020
This project replaced existing levee underseepage control features. Seven relief wells were decommissioned and replaced with a seepage sand berm measuring approximately 1,500 feet in length and 275 feet in width . The sand berm was partially constructed utilizing existing sand berm material on-site placed during the 2011 flood. Over 40,000 cubic yards of additional sand berm material was hauled to site to complete the berm.
Levee Drainage Structure Improvement (Drainage MR_2)
COMPLETED IN 2019
The project improved drainage pipes through the levee and the outfall structure at the river.
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Levee Structural Improvement and Encroachment Removal (Structural MR_2)
Completed in 2016
The project removed an aged floodwall and replaced with earthen levee embankment. The project also removed old water infrastructure that was encroaching the levee system.
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Lake Manawa Sand Dredging
COMPLETED IN 2020
The city partnered with the Iowa Department of Natural Resources (IDNR) to complete a dredging project at Lake Manawa. While the dredging project is beneficial to the lake, the dredged sand will serve as an important material source for construction of planned sand seepage berms. A grand total of 519,805 cubic yards of sand suitable for seepage berms was successfully dredged from the lake.
Levee Underseepage Control Improvement (Geotechnical MR_1)
Completed in 2016
The project replaced existing levee underseepage control features. Twenty one original relief wells were replaced with a pervious toe trench with collector pipe system. The pervious toe trench is supplemented with a sand berm. The sand berm was partially constructed utilizing existing sand berm material on-site placed during the 2011 flood.
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Levee Underseepage Control Improvement (Geotechnical MR_2)
Completed
The project modified the existing relief well system by retrofitting the system with a buried discharge pipe system to collect flow from the relief wells. A groundwater sump was constructed to collect and allow for pumping of flow collected from the relief wells.
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Levee Railroad Flood Gate Closure Rehabilitation (Structural MR_1)
Completed
The project rehabilitated the existing Union Pacific Railroad flood gate closure. New mechanical features were installed and the flood gate was repainted. The damaged sill of the closure was repaired.
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Levee Underseepage Control Improvement (Geotechnical MR_7)
completed
The project replaced existing levee underseepage control features. Seven new relief wells were installed to replace seven original relief wells. A stability and seepage sand berm was installed to supplement the relief wells. The sand berm was constructed utilizing existing sand berm material on-site placed during the 2011 flood.
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Levee Encroachment Removal (Pacific Fruit Express Pump Station Abandonment)
COMPLETED
The project properly abandoned an out of service pump station and out of service gas line.