US Army Corps of Engineers
St. Louis District

Upper Joachim Creek

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 flood plain. An 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 City and County. 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.
  • Public and political support for activities and projects and a community that wants to see the plan’s recommendations implemented.

Joachim Creek: The City of De Soto, Missouri is situated in Jefferson County, approximately 45 miles south of St. Louis in the Upper Joachim Creek watershed (HUC12). The watershed has a total drainage area of 39,154 acres, and the City of De Soto, at the downstream end, is the only incorporated city in the watershed. There are 1,642 acres of Federal Emergency Management Agency mapped flood hazard area in the watershed, most of which are within the city limits. The City has historically been prone to flash flooding but has experienced an increase both in frequency and intensity in recent years with five flood events in the last four years.

Upper Joachim Creek Watershed