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Lower Meramec Basin

Floodplain Management Plans: A Floodplain Management Plan is a document that identifies the hazards and impacts of flooding in a given area. The plan identifies ways that a community can reduce the impacts of flooding and make effective use of water and related land resources within the floodplain. A FMP takes into consideration all structural and non-structural measures that could help achieve its objectives.

Once completed, the FMP will serve as a blueprint that can be implemented by the Cities and Counties. It will include:

  • Flood risk reduction strategies that are current, technically sound and considers all possible mitigation alternatives and the consequences of those alternatives.
  • Prioritization of resources to reduce risk to the furthest extent and minimize effect on natural floodplain functions.
  • Fosters public and political support for activities and projects and a constituency that wants to see the plan’s recommendations implemented.

Lower Meramec Floodplain: Three record flood events have occurred within the Lower Meramec Basin since August 2015, and new record stages have been recorded on all river gages in the two million acre Meramec Basin. Damages in the Meramec River Basin are attributed to many factors including increased frequency of heavy rainfall and severe storms, geology, topography, land use changes, storm water runoff, and loss of wetlands and open space. Land use changes  in the Lower Meramec floodplain and other flood-prone areas of the watershed has reduced flood storage.

The development of a multi-jurisdictional floodplain management plan will identify findings and the specific action items (and their timing) for non-structural measures, practices, and policies to reduce loss of life, injuries, damages to property and facilities, public expenditures, and other adverse impacts associated with flooding.

Lower Meramec Watershed

Activity Date
Proposal Submitted Summer 2017
Proposal Selected Fall 2017
Project Scoping Fall 2017 – Early 2018
Public Meetings March 22, 2018 – Pacific, MO
March 29, 2018 – Sunset Hills, MO
April 11, 2018 – Arnold, MO
Flood Hazard Assessment Summer 2018
Risk Assessment End of 2018
Draft Report Spring 2019
Public Review (Draft Report findings, Post-analysis) Fall 2019
Final Report Fall 2019

Contact Information

U.S. Army Corps of Engineers
St. Louis District
Programs & Project Management

1222 Spruce Street
St. Louis, MO 63103-2833
(314) 331-8012
CEMVS-PPM@usace.army.mil