Blog · October 14, 2026 · Missouri
Marshall Flood Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Malta Bend.
Main page: Saline County, MO GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any purchase around Nelson, pull up the Marshall flood map: the zone on that map shapes insurance, permits and resale. What this Marshall guide covers: finding the address on FEMA's map, decoding A, AE and X, and matching it with the county parcel viewer.
The Marshall flood map: start here
The official source is FEMA's Flood Map Service Center: search an address around Slater, then open the map view for that panel. Rural land near Mount Leonard with no street number can still be found: zoom in from the nearest road and click the spot.
Opening the official parcel viewer
Go first to the IntegrityGIS - Saline County; it maps every assessed parcel from Gilliam to Mount Leonard. If you only know roughly where the land is, pan along the nearest road and click the parcel itself, whether the land is near Arrow Rock or elsewhere in the county. For a parcel near Nelson, write down the parcel ID from that panel; every clerk in the county will want it.
Low spots and local drainage
Low-lying fields near Slater may not have detailed mapping, so look for water marks and debris lines. Marshy spots near Arrow Rock can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
Limits of the parcel data
Listed acreage is a tax-roll number; only a licensed surveyor sets the real boundary for a parcel near Slater. Records update in batches, so a recent sale near Slater may not show yet.
Marshall, MO: the basics
Marshall sits in Saline County, Missouri, which means parcel data comes from the county. As the county seat, Marshall hosts the courthouse, handy when you need recorded documents. For a parcel near Nelson, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, while the county keeps the tax map. Lots just outside the city limits near Malta Bend often falls under county rules rather than the town's.
Land on the county line
Saline County meets Carroll County, Chariton County, Cooper County, Howard County, and Lafayette County, all with their own assessor records. Acreage along the edge near Malta Bend can show up across two assessors' files, so open the neighboring map as well. For a tract near Arrow Rock, the Platbookmapper state page lists every bordering county map for Missouri.
Getting your bearings
Marshall is the county seat, where most land records are kept. Other places on the map include Malta Bend, Mount Leonard, Slater, and Nelson, each with its own cluster of lots. Around 23,049 people live in Saline County (Census Bureau estimate, 2023) on roughly 756 square miles. Saline County was formed in 1820, which matters when you trace an old farm's title. Landmarks such as Big Muddy National Fish and Wildlife Refuge help you orient on the aerial around Slater.
What the zone letters mean
Zone AE carries a published BFE, while plain Zone A does not; builders around Gilliam design to it. Near Nelson, a shaded X area marks moderate flood hazard, roughly the 100- to 500-year range; unshaded X means minimal mapped risk.
Sections, lots and bearings
Missouri follows the Public Land Survey System, so deeds around Gilliam reference sections and townships. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though sections near Malta Bend can be irregular. Write down the legal description for the tract near Slater for any title or survey request.
Questions to ask before you buy
Request about past flood claims for the house near Slater; an insurance quote early avoids surprises.
On site with the map
Most viewers work in a phone browser, useful out on a road near Mount Leonard, so load it before you lose signal. A saved image of the lot near Mount Leonard and its lines keeps working without signal.
Parcel lines plus flood zones
FEMA's map shows zones but not ownership, so check the IntegrityGIS - Saline County too for the outline of the tract near Slater.
Lenders and permits
In and around Arrow Rock, get the Elevation Certificate if one exists: it compares the building to the BFE. Remodeling a house in a zone near Gilliam can trigger elevation rules; check with the county or town building office early.
Frequently asked
Can I see flood zones on the IntegrityGIS - Saline County?
Good question; a flood layer may appear in the IntegrityGIS - Saline County layer list, though it can lag behind FEMA's current panels.
What does an AE label mean for a lot near Gilliam?
It depends, but an AE zone has a 1% annual chance of flooding and a base flood elevation, which shapes building rules near Mount Leonard.
What is a base flood elevation around Nelson?
Short answer: the base flood elevation is the water level expected in the 1% annual chance flood; surveyors near Mount Leonard use it often.
What is a LOMA around Slater?
In most cases, you can ask FEMA for a LOMA if surveyed elevations show the building near Gilliam is above the BFE, and lenders accept the result.
Is the parcel map a survey for land near Gilliam?
No; boundary questions near Arrow Rock need a licensed surveyor.
Open the official Saline 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.