Levee Alterations Program
The risk of flooding in portions of the City of Des Moines is reduced by the Downtown Levee Local Flood Risk Management system, which consists of a series of levees and floodwalls along the Des Moines and Racoon Rivers. Following the 2008 Midwest flood, the Army Corps of Engineers (USACE) conducted a study to estimate the frequency and magnitude of river flows. Based on the results, it was found that the current system does not provide reliable risk reduction against a 100-year flood, thus affecting the system’s accreditation status by FEMA and impacting the City’s flood hazard mapping. The Des Moines Levee Alterations Program has been undertaken by the City to address the identified system deficiencies.
Goal of Program
The City plans to address these deficiencies by implementing a series of projects along the levee systems. These projects include levee raises, modification of gatewell and closure structures, embankment protection installation, pump station improvements and levee stability mitigating measures. The projects will be constructed in multiple phases (phases A through H) with a goal to have the projects completed by the summer of 2026.
When and where will the work take place?
Work will be divided up into eight different phases, with the first phase beginning in 2020 and the final phase projected to be completed in summer of 2026.
- Phase A: 2020 - 2021 (UNDER CONSTRUCTION)
- Phase B: 2021 - Early 2022
- Phase C: Fall 2021 - Early 2023
- Phase D: 2023
- Phase E: 2024 - 2025
- Phase F: 2026 - 2027
- Phase G: 2024 - 2025
- Phase H: 2026 - 2027
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