Blog · October 14, 2026 · South Dakota
Using the Dewey County Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near Swift Bird.
Main page: Dewey County, SD GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before you buy or build near La Plant, look at the Dewey County flood zone map: a mapped flood zone changes insurance, permits and resale. Covered here for Dewey County: locating a parcel on FEMA's map, decoding A, AE and X, and pairing it with the Dewey County CAMAvision map.
Getting started with the Dewey County flood zone map
For property near Lantry, flood zones come from FEMA's Flood Map Service Center: enter the street address, and choose the dynamic map. Rural land near Green Grass with no street number can still be found: zoom in from the nearest road and click inside the land.
Pulling up a parcel
The public parcel map for this area is the Dewey County CAMAvision map, and no login is needed to use it. When a rural tract has no street number, follow the nearest road on the aerial and click the parcel itself, for land near Lantry included. If you're looking near Isabel, save the parcel ID before closing the panel; every clerk in the county uses it to find the file.
Beyond the mapped zones
Creeks and ditches near Isabel aren't always studied in detail, so look for water marks and debris lines. Wetlands near North Eagle Butte can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
Decoding the flood zone labels
For property near La Plant, any A or V zone are Special Flood Hazard Areas, which FEMA defines as a 1% annual chance of flooding. If you're looking near Lantry, a shaded X area is moderate risk, roughly the 100- to 500-year range; plain X, or C on older maps, is minimal risk.
Reading the legal description
South Dakota uses the Public Land Survey System, so rural legal descriptions near Lantry cite section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though real sections near Timber Lake vary in size. Keep the legal description for land near Timber Lake when you talk to a surveyor.
Before you lean on the lines
In and around Isabel, acreage on the record is a tax-roll number; just a licensed surveyor sets the real lines on the ground. Near Missouri River, records update in batches, so a deed recorded last month can take weeks to appear.
Matching the zone to the lot lines
FEMA's map shows zones but not ownership, so open the Dewey County CAMAvision map next to confirm you have the right parcel near La Plant.
Which office to call
For assessment questions about property around La Plant are handled by the Director of Equalization, which maintains the tax roll. Questions about what you can build around Swift Bird need the planning or permitting office, and the answer depends on jurisdiction.
What a flood zone means for a buyer
If a building sits in a Special Flood Hazard Area and the loan is federally backed or regulated, mandatory purchase rules apply in communities in the NFIP, whether the land is near Timber Lake or elsewhere in the county. New construction in a floodplain near La Plant often needs a floodplain permit; ask the local floodplain administrator before you plan.
On site with the map
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Timber Lake, so load it before you lose signal. A screenshot of the parcel near Swift Bird with its ID keeps working without signal.
What to request from a seller
For a home near Timber Lake, ask the listing agent about past flood claims before closing; getting a quote early avoids surprises.
Places you'll see on the map
Timber Lake is the county seat, where most land records are kept. Other places on the map include Eagle Butte, Isabel, Green Grass, and La Plant, where town lots give way to larger tracts. Roughly 5,208 people live in this county (Census estimate, 2023) on some 2,302 square miles, at least around Isabel. Features like Missouri River help you orient on the aerial around Isabel.
Frequently asked
What is the difference between Zone A and AE around La Plant?
For a tract near Isabel, an AE zone has a 1% annual chance of flooding and a base flood elevation; unnumbered A zones don't list one.
When is flood insurance required near Green Grass?
Generally, for a building near La Plant in an A or V zone with a federally backed or regulated mortgage, it's generally required, in communities that take part in the NFIP.
Can I see flood zones on the Dewey County CAMAvision map?
For most people, a flood layer may appear in the Dewey County CAMAvision map layer list, but FEMA's own map is the official source.
Where do I find the BFE for a lot near Swift Bird?
A BFE near Eagle Butte tells builders how high the lowest floor should be; local rules may require building above it.
Who do I call about a parcel near Timber Lake?
With a lot near Eagle Butte, values are the Director of Equalization's job; recorded documents belong to the Register of Deeds, while zoning questions go to planning
Open the official Dewey County, SD 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.