Blog · October 14, 2026 · Montana
Reading the Big Horn County Flood Zone Map for a parcel
The zone on FEMA's map affects insurance, building and resale near Bighorn Canyon National Recreation Area.
Main page: Big Horn County, MT GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any purchase around Bighorn Canyon National Recreation Area, check the Big Horn County flood zone map: a mapped flood zone changes insurance, permits and resale. Covered here for Big Horn County: finding the address on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
The Big Horn County flood zone map: start here
In and around Fort Smith, flood zones come from FEMA's Flood Map Service Center: enter the street address, then open the map view for that panel. A tract near Lodge Grass without an address can still be found: pan from the closest town and click the spot.
The free map to start with
Begin with the Montana Cadastral; it covers every assessed parcel in the county, Forty Mile Colony included. Around Crow Agency, type a street address, an owner's name or a parcel number, then pick the result to center the map on it. With a lot near Forty Mile Colony, save the parcel ID from that panel; each office in the county will want it.
Limits of the parcel data
The acreage figure is a tax-roll number; just a licensed surveyor sets the real boundary for a parcel near Bighorn Canyon National Recreation Area. Records update in batches, so a fresh transfer around Bighorn Canyon National Recreation Area may not show yet.
Using it on a phone
The parcel map usually runs in a mobile browser, useful out on a road near Fort Smith, so load it before you lose signal. A screenshot of the parcel near Bighorn Canyon National Recreation Area with its ID keeps working without signal.
Water near Busby
Small streams around Crow Agency aren't always studied in detail, so walk the land after rain. Marshy spots near Crow Agency can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
What to request from a seller
Ask the seller for any Elevation Certificate on the property near Crow Agency; an insurance quote early avoids surprises.
When a parcel crosses a boundary
Big Horn County meets Carbon County, Powder River County, Rosebud County, Treasure County, and Yellowstone County, and each of those keeps its own parcel map. A tract near the line by Muddy can show up across two assessors' files, so open the adjacent map as well. For a tract near Lodge Grass, our state page links each bordering county map across Montana.
Decoding the flood zone labels
For acreage around Forty Mile Colony, any A or V zone mark the Special Flood Hazard Area, which FEMA defines as a 1% annual chance of flooding. For a tract near Forty Mile Colony, minimal risk is not no risk: according to FEMA, many claims come from moderate- and low-risk areas.
Big Horn County in a few facts
Hardin serves as the county seat, which is where the courthouse records live. Other places on the map include Lodge Grass, Busby, Crow Agency, and Fort Smith, where town lots give way to larger tracts. About 12,751 people call Big Horn County home (Census estimate, 2023) spread over some 4,998 square miles. Big Horn County was formed in 1913, and some chains of title near Busby are long. Features like Bighorn Canyon National Recreation Area help you orient on the aerial.
Lining it up with the parcel map
FEMA's map shows zones but not ownership, so check the Montana Cadastral too for the outline of the tract near Bighorn Canyon National Recreation Area.
Sections, lots and bearings
Montana is laid out under the Public Land Survey System, so deeds around Bighorn Canyon National Recreation Area reference sections and townships. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though real sections near Bighorn Canyon National Recreation Area vary in size. Keep the legal description for land near Hardin before you request a deed or survey.
What a flood zone means for a buyer
With a lot near Forty Mile Colony, get the Elevation Certificate if one exists: it can change the insurance price a lot. New construction in a floodplain near Bighorn Canyon National Recreation Area often needs a floodplain permit; check with the county or town building office before you plan.
Quick answers
How often are flood maps updated around Lodge Grass?
In most cases, zones near Forty Mile Colony can shift when FEMA updates a panel, so look at the panel date.
Why does the BFE matter near Bighorn Canyon National Recreation Area?
Short answer: the BFE is printed in AE zones on FEMA's map; surveyors near Bighorn Canyon National Recreation Area use it often.
Where can I see the Big Horn County flood zone map for free?
Look up the spot near Bighorn Canyon National Recreation Area in FEMA's National Flood Hazard Layer viewer, which takes a couple of minutes.
Is Zone X safe from flooding around Busby?
Generally, shaded X is moderate risk and unshaded X is minimal risk; many owners near Busby buy coverage anyway.
What's a legal description for land near Lodge Grass?
For a tract near Forty Mile Colony, it's the formal description of the land in the deed; a surveyor can interpret it.
Open the official Big Horn 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.