Blog · October 14, 2026 · South Dakota
Custer County Flood Zone Map (South Dakota)
How to check if a property in Custer County sits in a FEMA flood zone, and what the answer means for a buyer near Buffalo Gap.
Main page: Custer County, SD GIS & Parcel Viewer (official map link, Custer County facts and neighboring maps).
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A Custer County flood zone map check belongs in the due diligence for any Custer County property, from a house lot in Pringle to farm ground near Hermosa. Here's how to read FEMA's map for a Custer County, SD property and match it to the parcel record.
We'll cover finding a Custer County address on FEMA's map, what Zone A, AE and X mean, how the county viewer fits in, and what to do if the map looks wrong.
Look up the Custer County flood zone map step by step
The authoritative source for a Custer County flood zone map is FEMA, so begin at the FEMA Flood Map Service Center. Download the FIRM panel FEMA lists as effective for that part of Custer County. If the PDF panel for Custer County is hard to read, the National Flood Hazard Layer viewer is easier to use, so you can see if the shading reaches a house near Fairburn. Then open the Custer County Beacon site for Custer County to confirm the parcel near Hermosa. The Custer County record gives the parcel identifier and legal description that an insurer or lender near Hermosa may ask for.
Search Custer County parcels by owner, address or ID
For land around Buffalo Gap, open the Custer County Beacon site (Schneider Geospatial's Beacon platform); it's the map Custer County itself publishes. In the county version, the search page takes an owner, an address or a parcel ID, and each report links back to the map view for the piece of ground near Hermosa. Bookmark our Custer County page too; it tracks the official South Dakota link if it moves and lists the maps around Hermosa.
Reading the zones on a Custer County flood map
On the FIRM covering Custer County, zones that start with A or V are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any given year (the base or 100-year flood). A surveyor working near Hermosa uses the base flood elevation printed for AE zones; unnumbered A zones do not have one. Shaded Zone X around Hermosa falls between the base flood and the 500-year flood. Clear, unshaded X near Hermosa is outside the 500-year floodplain.
Where Custer County land records are kept
For land near Hermosa, the deed itself lives in the county recording office, and the map is an index to it. A deed book and page or instrument number on the county record is the fastest way to order the document for a lot in Hermosa.
Waterfront parcels near Fairburn
Parcels touching Cheyenne River deserve a FEMA check before anything else in Custer County. Waterfront and bottomland parcels near Hermosa often carry a zone along one edge, so check where the buildable part sits. A low spot on a Custer County tract outside any mapped zone, which is why it's worth walking the ground after a heavy rain.
Flood insurance and building rules in Custer County
Insurance is the practical stake for a Custer County buyer. Where a building in Hermosa falls inside an A or V zone and is financed by a regulated or federally insured lender, federal rules call for flood insurance under the Flood Disaster Protection Act, wherever the community joins the NFIP. Outside the A zones around Fairburn, coverage is optional, though a lender in South Dakota can still ask for it. When a county homesite is on a rise inside a mapped zone, FEMA's LOMA process allows a review; a surveyor near Fairburn can supply the elevation data. Placing fill on low ground near Hermosa typically needs a floodplain permit, so call the county or the town office in Hermosa before work starts.
Custer County at a glance
Custer is the county seat, and Buffalo Gap, Fairburn, Hermosa, and Pringle are among the other towns on the county map. Smaller places such as Dewey and Four Mile appear on the county map as little clusters of lots. Census Bureau estimates put Custer County at about 9,117 residents in 2023 on approximately 1,557 square miles of land. Outside Buffalo Gap, most of the county map is farm, ranch or timber ground with large, irregular tracts.
Tracts that cross the Custer County line
Near the edge of the county, check the next map over: Fall River County, Oglala Lakota County, Pennington County, Niobrara County, WY, and Weston County, WY all border it. Our South Dakota page links each map neighboring Custer County.
Custer County, SD: common questions
Who prepares an elevation certificate for a house in Pringle?
Hire a licensed surveyor or engineer who works in Custer County; ask the local floodplain office first in case one exists.
Do I need flood insurance in Zone X in Custer County?
For a Zone X house near Hermosa, federal rules do not require flood insurance; buying it is still a choice worth pricing.
Is my Pringle address in a flood zone?
Look it up at FEMA's Flood Map Service Center, then match the parcel lines in the Custer County Beacon site; for land near Hermosa, a zone starting with A or V is high risk.
Do I need a permit to build in the floodplain near Pringle?
Building in a Special Flood Hazard Area near Pringle typically needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
What does 100-year flood mean for Custer County land?
No, ground around Pringle mapped that way carries a 1-in-100 chance in any single year, and two floods in one decade near Pringle are possible.
Is there a floodplain layer in the Custer County Beacon site?
Check the layer list in the Custer County Beacon site; if Custer County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Open the official Custer County, SD parcel map Custer County 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.