Blog · October 14, 2026 · North Dakota
The Cass County Flood Zone Map: a North Dakota guide
Look up any Cass County address on FEMA's flood map, read the zone, and match it to the parcel record for land around Amenia.
Main page: Cass County, ND GIS & Parcel Viewer (official map link, Cass County facts and neighboring maps).
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Land along Red River of the North and the flats outside Briarwood are where a Cass County flood zone map lookup matters most. FEMA's free Flood Map Service Center and the Cass County parcel viewer answer it together.
We'll cover finding a Cass 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.
How to check the Cass County flood zone map
Open the FEMA Flood Map Service Center and type a county street address, say one in Ayr. The site returns the effective Flood Insurance Rate Map (FIRM) panel covering that Ayr location, which you can view or download. For an interactive view of the county, FEMA's National Flood Hazard Layer viewer draws the zones over aerial imagery, so you can see whether the shading reaches a house near Arthur. Next, the Cass County ArcGIS parcel map confirms which Cass County parcel you're looking at. If the Cass County viewer has a floodplain layer, treat it as a convenience copy and confirm on FEMA's map.
Search Cass County parcels by owner, address or ID
Cass County publishes its parcels on the Cass County ArcGIS parcel map, which runs on an Esri ArcGIS web map, free to use for a lot in Alice or a tract around Amenia. Use the search box for an address in Alice or a parcel number, or simply zoom in and click a tract around Amenia. Our Cass County, ND page keeps the official link and the maps next door to Amenia in one place.
High, moderate and minimal risk in Cass County
For a lot in Ayr, the label matters more than the color: A and V zones are Special Flood Hazard Areas, defined by a 1-percent annual chance of being flooded. Where a Cass County tract displays Zone AE, there's a base flood elevation to compare a building against; in Zone A there isn't one. If a Cass County parcel displays shaded Zone X, it sits in the moderate band between the 100-year and 500-year floods. Clear, unshaded X near Ayr is outside the 500-year floodplain.
The lay of the land around Fargo
Town lots cluster around Fargo, the county seat, and Alice, Amenia, Argusville, and Arthur. Unincorporated communities in the county, including Brooktree Park, Embden, and Erie, display up as small groups of parcels along the roads. Roughly 1,765 square miles of land and about 196,362 residents (2023 estimate) make up Cass County. Platted neighborhoods near Fargo give way to rural acreage elsewhere in the county. With a founding date of 1873, Cass County has long chains of title on some rural tracts.
Tracts that cross the Cass County line
Near the edge of the county, check the next map over: Clay County, MN, Norman County, MN, Barnes County, Ransom County, and Richland County all border it. Every map bordering Cass County is listed on our North Dakota directory.
Where water shapes land in Cass County
Parcels touching Red River of the North deserve a FEMA check before anything else in Cass County. Lines on those Cass County parcels often follow the water, so part of the tract can be mapped as high risk. Small streams and ditches near Ayr may not be studied in detail, so treat an unmapped channel as a reason to ask questions, not proof the ground stays dry.
Recorded documents in Cass County, North Dakota
For land near Ayr, the deed itself lives in the county recording office, and the map is an index to it. Copy the parcel number and legal description from the county record well before you request a deed for land near Fargo.
Flood insurance and building rules in Cass County
Here's why the zone matters at a closing in Ayr. When a Cass County home sits in a Special Flood Hazard Area and secures a loan from a federally regulated or insured lender, flood insurance is mandatory under the Flood Disaster Protection Act, wherever the community joins the NFIP. For a Cass County home in shaded or unshaded X, coverage is optional, although a lender in North Dakota can still ask for it. Where a structure near Ayr looks higher than the shading suggests, a Letter of Map Amendment request is the formal route, typically backed by an elevation certificate from a surveyor who works in the county. Adding on to a house near Arthur inside the zone typically needs a floodplain permit, and the building office serving Arthur explains the steps.
Cass County, ND: common questions
Does a 100-year floodplain near Ayr flood only once a century?
No, ground around Fargo mapped that way faces a 1-percent annual chance, so floods can come in back-to-back years.
Where do I get an elevation certificate in Cass County?
A licensed surveyor or engineer prepares it, and the building office serving Fargo may already have one on file for newer construction.
Is there a floodplain layer in the Cass County ArcGIS parcel map?
Check the layer list in the Cass County ArcGIS parcel map; if Cass County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Can I build in a flood zone in Cass County?
Often, but local floodplain rules apply; ask the county or town building office in Fargo well before you buy.
What does BFE mean on the flood map for Fargo?
Near Ayr, it is the projected water surface in the base flood; elevation certificates in Cass County are measured against it.
Open the official Cass County, ND parcel map Cass 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.