Blog · October 14, 2026 · Utah
Duchesne County Flood Zone Map, Utah
How to check whether a property in Duchesne County sits in a FEMA flood zone, and what the answer means for a buyer near Altamont.
Main page: Duchesne County, UT GIS & Parcel Viewer (official map link, Duchesne County facts and neighboring maps).
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A Duchesne County flood zone map check belongs in the due diligence for any Duchesne County property, from a house lot in Myton to farm ground near Roosevelt. Here's how to read FEMA's map for a Duchesne County, UT property and match it to the parcel record.
We'll cover finding a Duchesne 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.
Where to see the official Duchesne County flood zone map
The authoritative source for a Duchesne County flood zone map is FEMA, so begin at the FEMA Flood Map Service Center. Search returns the effective FIRM panel for the spot in Duchesne County, plus any pending changes FEMA has posted. For an irregular lot near Roosevelt, FEMA's National Flood Hazard Layer viewer draws the zones over aerial imagery; zoom to the property near Roosevelt and click. Then open the Duchesne County ArcGIS parcel map for Duchesne County to confirm the parcel near Myton. If the Duchesne County viewer has a floodplain layer, treat it as a convenience copy and confirm on FEMA's map.
Step one: the free Duchesne County viewer
Duchesne County publishes its parcels on the Duchesne County ArcGIS parcel map, which runs on an Esri ArcGIS web map, free to use for a lot in Tabiona or a property near Altamont. Use the search box for an address in Tabiona or a parcel number, or simply zoom in and click a property near Altamont. For a backup route to the map covering Altamont, our Duchesne County directory entry keeps the link current.
Zone A, AE and X in plain English
On the FIRM covering Duchesne County, zones that start with A or V are Special Flood Hazard Areas, meaning FEMA estimates a 1-percent annual chance of flooding. A surveyor working near Myton uses the base flood elevation printed for AE zones; unnumbered A zones do not have one. If a Duchesne County parcel displays shaded Zone X, it falls between the base flood and the 500-year flood. Clear, unshaded X near Myton is outside the 500-year floodplain.
Unmapped creeks in Duchesne County
A low spot on a Duchesne County tract outside any mapped zone, which is why it's worth walking the ground after a heavy rain.
A short buyer checklist for Altamont
Request any past flood claims history for a Duchesne County property before closing; it tells you more than the map alone. Then call an insurance agent who writes policies around Altamont and get a quote using the zone and the county parcel address.
Reading the fine print on a Duchesne County panel
Zones on the map covering Altamont can change after a restudy, so the date on the county panel matters. A floodway on a county panel marks the part of the floodplain that carries the main flow, and it's treated more strictly than the rest of the zone near Boneta.
What a flood zone means for a Duchesne County buyer
Lenders watch the zone closely on Duchesne County properties. When a county home falls inside an A or V zone and carries a federally backed mortgage, flood insurance is mandatory, provided the community near Myton takes part in the National Flood Insurance Program. For a Duchesne County home in shaded or unshaded X, insurance is a choice, not a mandate, although some lenders require it anyway. When a county homesite is on a rise inside a mapped zone, the landowner can ask FEMA for a Letter of Map Amendment (LOMA); a surveyor near Roosevelt can supply the elevation data. Adding on to a house near Roosevelt inside the zone has to meet local floodplain rules, so call the county or the town office in Myton before work starts.
Quick answers for Duchesne County
Where do I get an elevation certificate in Duchesne County?
Hire a licensed land surveyor or engineer who works in Duchesne County; ask the local floodplain office first in case one exists.
Does a 100-year floodplain near Roosevelt flood only once a century?
Not at all; a Duchesne County tract in that zone faces a 1-percent annual chance, not a once-a-century schedule.
Is there a floodplain layer in the Duchesne County ArcGIS parcel map?
Check the layer list in the Duchesne County ArcGIS parcel map; if Duchesne County includes a floodplain layer, confirm the zone on FEMA's map anyway.
What does BFE mean on the flood map for Altamont?
Near Roosevelt, it's the projected water surface in the base flood; elevation certificates in Duchesne County are measured against it.
Is Zone AE near Roosevelt high risk?
Zone AE on a lot in Altamont is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
Open the official Duchesne County, UT parcel map Duchesne 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.