Blog · October 14, 2026 · North Dakota
Dunn County Flood Zone Map, North Dakota: a practical guide
The zone on FEMA's map affects insurance, building and resale near Lake Ilo National Wildlife Refuge.
Main page: Dunn County, ND GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before an offer near Dunn Center, pull up the Dunn County flood zone map: FEMA's zone label affects insurance, permits and resale. What this Dunn County guide covers: locating a parcel on FEMA's map, decoding A, AE and X, and pairing it with the Dunn County Portico map.
Checking the Dunn County flood zone map step by step
The official source is FEMA's Flood Map Service Center: search an address around Dodge, and choose the dynamic map. Rural land near New Hradec with no street number can still be found: search the nearest road and click the spot.
Pulling up a parcel
The public parcel map for this area is the Dunn County Portico map, and anyone can open it without signing up. With a lot near Dodge, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. For land near Marshall, write down the parcel ID from that panel; every office in the county asks for it first.
A short flood checklist
For a home near Manning, ask the seller about past flood claims before closing; getting a quote early keeps the budget honest.
What the zone letters mean
With a lot near Marshall, zones beginning with A or V mark the Special Flood Hazard Area, land with a 1-percent chance of flooding in any year. For a parcel near Killdeer, shaded Zone X is moderate risk, between the 1% and 0.2% annual chance floods; unshaded X is minimal risk.
Land on the county line
Dunn County borders Billings County, McKenzie County, McLean County, Mercer County, and Mountrail County, all with their own assessor records. Acreage along the edge near New Hradec may show up across two assessors' files, so check the adjacent map as well. For a home near Lake Ilo National Wildlife Refuge, our state page links each bordering county map for North Dakota.
Recorded documents worth pulling
With a lot near Dodge, the map is an index, not the title: deeds, subdivision plats and easements for parcels in the county sit with the County Recorder. Long-held tracts around Halliday may go back through many deeds, so a title company earns its fee before a purchase.
Sections, lots and bearings
North Dakota uses the Public Land Survey System, so rural legal descriptions near Dunn Center cite section, township and range. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though corrections make some sections near Lake Ilo National Wildlife Refuge odd-sized. Write down the legal description for the tract near Dodge for any title or survey request.
Lining it up with the parcel map
FEMA doesn't draw property lines, so check the Dunn County Portico map too to see exactly which lot near Halliday you're looking at.
Lenders and permits
With a lot near Dodge, ask for an Elevation Certificate: it can change the insurance price a lot. Building or adding on near Dodge in a mapped zone usually means extra permit review; call the permitting office early.
Beyond the mapped zones
Low-lying fields near Manning may not have detailed mapping, so ask neighbors about past flooding. Wet ground around Twin Buttes is a separate issue from flood zones; the National Wetlands Inventory mapper shows mapped wetlands.
Taking the map into the field
Most viewers work in a phone browser, handy when you're parked on a road near Halliday, though signal can drop in rural spots. A saved image of the lot near Twin Buttes and its lines keeps working without signal.
Limits of the parcel data
The acreage figure is a tax-roll number; just a licensed surveyor sets the real corners for a parcel near Halliday. If the land is near Halliday, owner names and values update on a schedule, so a deed recorded last month can take weeks to appear.
Offices that can help
Questions about value or the owner field for land near Twin Buttes belong with the Director of Tax Equalization, since that office keeps the assessment data. Questions about what you can build around Dunn Center are for the local planning and health departments, depending on whether the land is inside town limits.
Dunn County: common questions
Can I see flood zones on the county Portico map near Marshall?
Good question; a flood layer may appear in the Dunn County Portico map layer list, but FEMA's own map is the official source.
When is flood insurance required around Lake Ilo National Wildlife Refuge?
For a home near Killdeer, it's typically required only for structures in high-risk zones with federally backed loans; elsewhere it's optional.
What is a base flood elevation around Dodge?
In and around New Hradec, the BFE is printed in AE zones on FEMA's map, and an Elevation Certificate compares the building to it.
Is AE a high-risk flood zone near New Hradec?
Out toward New Hradec, AE is a Special Flood Hazard Area with a published base flood elevation; unnumbered A zones don't list one.
Is the parcel map a survey around Lake Ilo National Wildlife Refuge?
For acreage around New Hradec, parcel lines are tax drawings, not surveys; a survey sets the real corners
Open the official Dunn County, ND 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.