Flood Zones Along the Meramec River in St. Louis County, Missouri

The Valley Park levee and what it revealed about flood protection along the Meramec

The core lesson of the ProPublica/Reveal "Flood Thy Neighbor" investigation is that flood protection along the Meramec River corridor was never built as a single, coordinated system -- after nearly a century of planning that at various points considered protecting multiple communities together, the federal government ultimately built a single roughly 3-mile levee that shields Valley Park specifically. That levee held during major floods in 2015 and again roughly 16 months later, while neighboring communities along the same river faced the water the levee diverted around Valley Park. The reporting also traced how the combined population of Arnold, Fenton, Valley Park, Eureka, and Pacific grew nearly 50% between 1980 and 2010, meaning more homes and more people have moved into a river corridor whose flood protection is genuinely uneven from one town to the next.

The practical implication for a buyer isn't that the whole Meramec corridor is uniformly risky or uniformly safe -- it's that flood risk here is highly local and can differ sharply between two parcels a short distance apart depending on levee coverage, elevation, and which community's flood-control infrastructure (if any) reaches that specific address. Don't extrapolate from a neighboring town's flood history, or from a levee's presence somewhere in the area, to conclusions about a specific parcel's actual risk.

What to check before buying in this corridor

Start with the standard steps -- pull the current FEMA Flood Insurance Rate Map for the specific parcel through the Flood Map Service Center, and confirm with St. Louis County's Department of Planning (which administers Chapter 1008, the county's floodplain management regulations, for unincorporated land) whether the parcel sits in a mapped Special Flood Hazard Area and what that would mean for insurance and any future construction or substantial improvement. If the parcel is inside an incorporated city like Fenton, Valley Park, Eureka, or Pacific, confirm with that city's own floodplain administrator instead, since municipal floodplain management can differ from the county's.

Then go further than the flood map alone: ask directly whether the parcel or its immediate area has been the subject of a flood-related buyout offer or discussion, whether it flooded during the 2015, 2016, or subsequent Meramec high-water events even if it sits just outside the current mapped floodplain, and whether any levee or flood-control structure in the area protects that specific parcel or instead sits on the other side of a levee line from it. A seller's flood-insurance claim history (available through a flood disclosure or, for federally backed insurance, potentially through a lender's flood determination) is worth requesting directly rather than relying solely on the current FEMA map, particularly for older maps that may not reflect more recent development or hydrology changes along the river.

If you're looking along the Mississippi riverfront in areas like unincorporated Lemay rather than the Meramec corridor specifically, ask directly whether the county has discussed or executed buyouts nearby -- the roughly $2.8 million, 16-property Lemay buyout is a documented precedent for how the county has handled chronic flood risk along that river as well, and a similar conversation could be relevant to a specific parcel's long-term outlook even if no formal buyout offer currently exists for it.