Blog · October 14, 2026 · Missouri
Florissant Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Calverton Park takes a few minutes.
Main page: St. Louis County, MO GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any purchase around Ferguson, check the Florissant flood zone map: FEMA's zone label affects insurance, permits and resale. In this Florissant guide: locating a parcel on FEMA's map, reading the zone codes, and pairing it with the county ArcGIS parcel map, at least around Hazelwood.
Where the Florissant flood zone map lives
Start with FEMA's Flood Map Service Center: type an address near Ferguson, then open the map view for that panel. Rural land near Black Jack with no street number is still easy to locate: pan from the closest town then click the parcel area.
Pulling up a parcel
Parcels around Calverton Park appear on the St. Louis County ArcGIS parcel map, a viewer that needs no account. When a rural tract has no street number, pan along Interstate 64 until the lines appear, then click inside the one you want. Closer to Berkeley, a pop-up or side panel normally shows the owner of record, assessed acreage, the parcel number and in many cases the last transfer.
Getting your bearings
Clayton serves as the county seat, home to the main records offices. Other places on the map include Calverton Park, Black Jack, Berkeley, and Hazelwood. About 987,059 people call St. Louis County home (Census estimate, 2023) on roughly 508 square miles. St. Louis County was organized in 1812, which matters when you trace an old farm's title. Features like Spanish Lake Park and Babler State Park are easy to spot when you zoom out from Dellwood.
Florissant and the county around it
Florissant lies within St. Louis County, Missouri, and the county assessor maps its lots. Out toward Berkeley, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, while the county keeps the tax map. Land beyond the city limits out by Berkeley often answers to county rules, not municipal ones.
What the zone letters mean
Zone AE carries a published BFE, and an unnumbered A zone has none; builders around Ferguson design to it. For a home near Dellwood, shaded Zone X is moderate risk, between the 1% and 0.2% annual chance floods; plain X, or C on older maps, is minimal risk.
Legal descriptions in Missouri
Missouri is laid out under the Public Land Survey System, so deeds around Hazelwood reference sections and townships. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though corrections make some sections near Calverton Park odd-sized. Copy the legal description from the record for the parcel near Calverton Park for any title or survey request.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so check the St. Louis County ArcGIS parcel map too to confirm you have the right parcel near Calverton Park.
Next door to this county for land near Hazelwood.
St. Louis County borders Madison County, IL, Monroe County, IL, St. Clair County, IL, Franklin County, and Jefferson County, all with their own assessor records. Acreage along the edge near Ferguson may show up in two county records, so open the adjacent map before you assume the acreage. If the land is near Calverton Park, the Platbookmapper state page links every bordering county map for Missouri.
A short flood checklist
Ask the seller whether the home has flooded for the house near Ferguson; getting a quote early keeps the budget honest.
Low spots and local drainage
Low-lying fields near Hazelwood may not have detailed mapping, so ask neighbors about past flooding. Marshy spots near Hazelwood can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
Getting answers from the right desk
Questions about value or the owner field for land near Black Jack go to the County Assessor, the office behind the parcel record. Zoning, permits and septic questions near Ferguson need the planning or permitting office, and the answer depends on jurisdiction.
Insurance, lenders and building
Near Calverton Park, an Elevation Certificate from a surveyor helps: it compares the building to the BFE. Building or adding on near Ferguson in a mapped zone usually means extra permit review; ask the local floodplain administrator before you plan.
Taking the map into the field
Most viewers work in a phone browser, useful out on a road near Ferguson, so load it before you lose signal. A saved image of the lot near Dellwood and its lines keeps working without signal.
Questions about the Florissant flood zone map
Can I challenge a flood zone near Black Jack?
In most cases, you can ask FEMA for a LOMA if surveyed elevations show the building near Ferguson is above the BFE, and lenders accept the result.
How often are flood maps updated around Berkeley?
Good question; zones near Calverton Park can shift when FEMA updates a panel; check the effective date on the panel.
What is a base flood elevation near Calverton Park?
It depends, but the base flood elevation is the water level expected in the 1% annual chance flood; surveyors near Ferguson use it often.
Can I see flood zones on the St. Louis County ArcGIS parcel map?
It depends, but a flood layer may appear in the St. Louis County ArcGIS parcel map layer list, though it can lag behind FEMA's current panels.
What's the tax parcel number used for around Calverton Park?
The parcel ID identifies one tax parcel near Hazelwood, and it's on the record panel and tax bills.
Open the official St. Louis County, MO parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.