Blog · October 14, 2026 · Montana
Reading the Chouteau County Flood Zone Map for a parcel
The zone on FEMA's map affects insurance, building and resale near Boneau.
Main page: Chouteau County, MT GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Geraldine? The Chouteau County flood zone map tells you whether FEMA puts it in a high-risk zone, and it costs nothing to check. What this Chouteau County guide covers: locating a parcel on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
Checking the Chouteau County flood zone map step by step
Flood zones come from FEMA's Flood Map Service Center: type an address near Fort Benton, and pick the FIRMette or map view. A tract near Fort Benton without an address is still easy to locate: search the nearest road and click the spot.
Where the parcel data lives
Your first stop is the Montana Cadastral; it covers every tax parcel in the county, Marias River included. For land near Loma, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. For a parcel near Big Sandy, the record panel usually lists the owner of record, acreage on the tax roll, a parcel ID and in many cases the last transfer.
Recorded documents worth pulling
For acreage around Marias River, the map is an index, not the title: recorded deeds, plats and easements for parcels in the county are filed with the County Clerk and Recorder. Long-held tracts around Highwood can sit on several deeds, so a title company earns its fee on a real sale.
Questions to ask before you buy
For land near Highwood, ask the seller for any Elevation Certificate before closing; an insurance quote early keeps the budget honest.
On site with the map
Most viewers work in a phone browser, which helps when you're standing on land near Floweree, so load it before you lose signal. A printout of the tract near Carter is a good backup.
Places you'll see on the map
Fort Benton is the county seat, where most land records are kept. You'll also find Big Sandy, Geraldine, Boneau, and Carter, where town lots give way to larger tracts. About 5,847 people live in Chouteau County (Census estimate, 2023) across about 3,973 square miles. Chouteau County dates to 1865, and some chains of title near Geraldine are long. Features like Teton River, Marias River, and Lewis and Clark National Forest make handy reference points on the map.
Reading A, AE and X
Closer to Floweree, zones beginning with A or V are Special Flood Hazard Areas, which FEMA defines as a 1% annual chance of flooding. Out toward Missouri River, a shaded X area marks moderate flood hazard, roughly the 100- to 500-year range; unshaded X means minimal mapped risk.
Parcel lines plus flood zones
FEMA's map shows zones but not ownership, so open the Montana Cadastral next to confirm you have the right parcel near Marias River.
Reading the legal description
Montana uses the Public Land Survey System, so rural legal descriptions near Teton River cite section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though corrections make some sections near Big Sandy odd-sized. Keep the legal description for land near Boneau when you talk to a surveyor.
A word on accuracy
For a parcel near Floweree, the acreage figure is an estimate; just a licensed surveyor sets the real boundary on the ground. Records update in batches, so a fresh transfer around Loma might lag behind.
Which office to call
If the acreage or value on a parcel near Carter looks off go to the Montana Department of Revenue, since that office keeps the assessment data. Questions about what you can build around Loma are for the local planning and health departments, and the answer depends on jurisdiction.
What a flood zone means for a buyer
For property near Boneau, an Elevation Certificate from a surveyor helps: it records the building's elevation against the base flood. New construction in a floodplain near Highwood usually means extra permit review; call the permitting office before you plan.
When a parcel crosses a boundary
Chouteau County touches Blaine County, Cascade County, Fergus County, Hill County, and Judith Basin County, and each of those keeps its own parcel map. Acreage along the edge near Highwood may show up in two county records, so check the neighboring map too. With a lot near Loma, the Platbookmapper state page lists every neighboring county map across Montana.
Beyond the mapped zones
Low-lying fields near Geraldine may not have detailed mapping, so ask neighbors about past flooding. Wet ground around Big Sandy is a separate issue from flood zones; check the National Wetlands Inventory mapper for a first look.
Chouteau County: common questions
Can a flood zone near Boneau change?
For most people, zones near Loma can shift when FEMA updates a panel; your community is notified before changes take effect.
Is Zone X safe from flooding for land near Teton River?
For most people, X zones around Floweree are lower risk, not no risk; FEMA notes that a large share of claims come from these areas.
What is a base flood elevation for land near Boneau?
For a parcel near Big Sandy, the BFE is printed in AE zones on FEMA's map; local rules may require building above it.
Where can I see the Chouteau County flood zone map for free?
In most cases, look up the spot near Carter in FEMA's National Flood Hazard Layer viewer; no account is needed.
Why do offices ask for the parcel ID for land near Big Sandy?
It's the number the Montana Department of Revenue uses to track a tract near Geraldine; copy it before you call anyone.
Open the official Chouteau County, MT 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.