Blog · October 14, 2026 · Missouri
Olivette Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Charlack takes a few minutes.
Main page: St. Louis County, MO GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Before you buy or build near Ladue, look at the Olivette flood zone map: FEMA's zone label affects insurance, permits and resale. What this Olivette guide covers: finding the address on FEMA's map, reading the zone codes, and pairing it with the St. Louis County ArcGIS parcel map.
Where the Olivette flood zone map lives
The official source is FEMA's Flood Map Service Center: type an address near Ladue, then open the map view for that panel. Vacant ground around Overland is still easy to locate: zoom in from Interstate 64 and click the spot.
Getting to the right map
Your first stop is the St. Louis County ArcGIS parcel map; it includes every assessed parcel from Overland to Vinita Park. Out toward Charlack, type a street address, an owner's name or a parcel number, then pick the result to center the map on it. For a home near Charlack, the parcel card typically gives the owner of record, acreage on the tax roll, the parcel number and sometimes recent sales.
Olivette, MO: the basics
Olivette lies within St. Louis County, Missouri, and the county assessor maps its lots. Around Ladue, city or town hall handles things like zoning, permits and utilities within town limits, while the county keeps the tax map. Lots just outside the town limits near Overland usually follows county rules, not municipal ones.
Land on the county line
For a parcel near Overland, st. Louis County borders Madison County, IL, Monroe County, IL, St. Clair County, IL, Franklin County, and Jefferson County, and each of those keeps its own parcel map. Ground near Overland that runs to the line may be split across two assessors' files, so open the adjacent map too. Around Charlack, our state page links every neighboring county map across Missouri.
Places you'll see on the map
With a lot near Hanley Hills, clayton is the county seat, which is where the courthouse records live. You'll also find Overland, Vinita Park, Ladue, and Sycamore Hills. Around Sycamore Hills, around 987,059 people live in St. Louis County (Census estimate, 2023) across about 508 square miles. St. Louis County was formed in 1812, and some chains of title near Hanley Hills are long. Features like Spanish Lake Park and Babler State Park help you orient on the aerial around Overland.
Questions to ask before you buy
Ask the seller about past flood claims for the house near Hanley Hills; an insurance quote early avoids surprises.
How land is described here
Missouri is laid out under the Public Land Survey System, so rural legal descriptions near Vinita Park cite section, township and range. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though real sections near Sycamore Hills vary in size. Write down the legal description for the tract near Overland when you talk to a surveyor.
Which office to call
For assessment questions about property around Ladue are handled by the County Assessor, the office behind the parcel record. Questions about what you can build around Sycamore Hills are for the local planning and health departments, town or county, depending on location.
Zones on the Olivette flood zone map
An AE label comes with a base flood elevation, which plain A zones lack; surveyors near Vinita Park use that number. On ground around Ladue, shaded Zone X marks moderate flood hazard, between the 1% and 0.2% annual chance floods; unshaded X is minimal risk.
Parcel lines plus flood zones
FEMA's map shows zones but not ownership, so check the St. Louis County ArcGIS parcel map too for the outline of the tract near Charlack.
The paper trail behind a parcel
For anything that matters, pull the recorded deed from the Recorder of Deeds; the parcel map near Hanley Hills only summarizes it. In and around Ladue, have ready the instrument number listed on the parcel record to skip a name search.
Low spots and local drainage
Creeks and ditches near Ladue aren't always studied in detail, so look for water marks and debris lines. Wet ground around Overland is a separate issue from flood zones; the National Wetlands Inventory mapper shows mapped wetlands.
What a flood zone means for a buyer
For a structure inside an A or V zone and the loan is federally backed or regulated, mandatory purchase rules apply in communities in the NFIP, and that holds around Vinita Park too. Remodeling a house in a zone near Charlack can trigger elevation rules; ask the local floodplain administrator before you plan.
Quick answers
Is AE a high-risk flood zone for land near Hanley Hills?
Generally, AE is a Special Flood Hazard Area with a published base flood elevation, so builders near Sycamore Hills design to that elevation.
Does the county parcel map show flood zones near Overland?
For most people, the parcel map near Sycamore Hills might show FEMA zones, though it can lag behind FEMA's current panels.
What is a base flood elevation near Sycamore Hills?
Good question; a BFE near Hanley Hills tells builders how high the lowest floor should be; surveyors near Sycamore Hills use it often.
What is a LOMA near Sycamore Hills?
Good question; you can ask FEMA for a LOMA if surveyed elevations show the building near Hanley Hills is above the BFE; it starts with an elevation survey.
Is the parcel map a survey near Vinita Park?
The map near Hanley Hills is approximate; a survey sets the real corners
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.