Blog · October 14, 2026 · Nevada
Lyon County Flood Zone Map in Nevada
Look up any Lyon County address on FEMA's flood map, read the zone, and match it to the parcel record for land around Yerington.
Main page: Lyon County, NV GIS & Parcel Viewer (official map link, Lyon County facts and neighboring maps).
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The Lyon County flood zone map question tends to arrive at a bad moment: a lender's letter, an insurance quote, or a permit counter in Yerington. You can check it yourself for any Yerington address in a few minutes.
Below are the FEMA links, a plain reading of the zone labels, notes on where water shapes land around Yerington, and short answers to common questions.
Where to see the official Lyon County flood zone map
Open the FEMA Flood Map Service Center and type a county street address, say one in Yerington. The site returns the effective Flood Insurance Rate Map (FIRM) panel covering that Yerington location, which you can view or download. For an interactive view of the county, the National Flood Hazard Layer viewer is easier to use, so you can see whether the shading reaches a house near Dayton. Then open the County Parcels in Nevada layer in ArcGIS Map Viewer for Lyon County to confirm the parcel near Yerington. Laying the county parcel outline beside the FEMA shading displays whether a homesite near Dayton sits above or inside the zone.
Step one: the free Lyon County viewer
There's no separate Lyon County parcel site to hunt for; the County Parcels in Nevada layer in ArcGIS Map Viewer carries the county's parcels along with the rest of Nevada. Most people track down their Lyon County tract fastest by searching an address in Fernley, then clicking the outline. For a backup route to the map covering Fernley, our Lyon County directory entry keeps the link current.
High, moderate and minimal risk in Lyon County
For a lot in Yerington, the label matters more than the color: A and V zones are Special Flood Hazard Areas, meaning FEMA estimates a 1-percent annual chance of flooding. A surveyor working near Yerington uses the base flood elevation printed for AE zones; unnumbered A zones don't have one. If a Lyon County parcel displays shaded Zone X, it sits in the moderate band between the 100-year and 500-year floods. Clear, unshaded X near Yerington is outside the 500-year floodplain.
Low ground and small streams around Yerington
A low spot on a Lyon County tract outside any mapped zone, so treat an unmapped channel as a reason to ask questions, not proof the ground stays dry.
Seller questions about flood history
Request any past flood claims history for a Lyon County property before closing; it tells you more than the map alone. Then call an insurance agent who writes policies around Fernley and get a quote using the zone and the county parcel address.
Reading the fine print on a Lyon County panel
The FIRM panel for Lyon County carries an effective date; if it's old, ask the county floodplain office whether new maps for land near Dayton are in progress. Floodways, shown as hatched areas on some panels, are the channel and nearby land that must stay open, and building there near Fernley faces the strictest rules.
What a flood zone means for a Lyon County buyer
Here's why the zone matters at a closing in Yerington. If a barn or house outside Yerington is mapped in a high-risk zone and carries a federally backed mortgage, flood insurance is mandatory under the Flood Disaster Protection Act, wherever the community joins the NFIP. Outside the A zones around Dayton, insurance is a choice, not a mandate, though a lender in Nevada can still ask for it. If a building near Dayton sits above the flood line, the titleholder can ask FEMA for a Letter of Map Amendment (LOMA), usually backed by an elevation certificate from a surveyor who works in the county. Adding on to a house near Dayton inside the zone usually needs a floodplain permit, so call the county or the town office in Yerington before work starts.
Lyon County flood zones questions
What does Zone AE mean on a Lyon County flood map?
Zone AE on a lot in Yerington is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
What does BFE mean on the flood map for Yerington?
For a Lyon County property in Zone AE, it's the projected water surface in the base flood; elevation certificates in Lyon County are measured against it.
Can I build in a flood zone in Lyon County?
Often, but local floodplain rules apply; ask the county or town building office in Yerington before you buy.
Does the Lyon County parcel map show flood zones?
Check the layer list in the County Parcels in Nevada layer in ArcGIS Map Viewer; if Lyon County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Do I need flood insurance in Zone X in Lyon County?
For a Zone X house near Fernley, federal rules don't require flood insurance; buying it is still a choice worth pricing.
Open the official Lyon County, NV parcel map Lyon 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.