Blog · October 14, 2026 · Idaho
Jefferson County Flood Zone Map (Idaho)
How to check whether a property in Jefferson County sits in a FEMA flood zone, and what the answer means for a buyer near Ririe.
Main page: Jefferson County, ID GIS & Parcel Viewer (official map link, Jefferson County facts and neighboring maps).
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The Jefferson County flood zone map question tends to arrive at a bad moment: a lender's letter, an insurance quote, or a permit counter in Lewisville. FEMA's free Flood Map Service Center and the Jefferson County parcel viewer answer it together.
We'll cover finding a Jefferson 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 Jefferson County flood zone map
Start at the FEMA Flood Map Service Center and enter the property address in Ririe or anywhere else in the county. If a tract close to Menan has no street number yet, search the nearest road and pan to it. On acreage outside Ririe, the National Flood Hazard Layer viewer is easier to use and reports the zone wherever you click near Ririe. Then open the Idaho statewide Parcels layer in ArcGIS Map Viewer for Jefferson County to confirm the parcel near Ririe. Laying the county parcel outline beside the FEMA shading lists whether a homesite near Menan sits above or inside the zone.
The county map you'll pair it with
There's no separate Jefferson County parcel site to hunt for; the Idaho statewide Parcels layer in ArcGIS Map Viewer carries the county's parcels along with the rest of Idaho. Use the search box for an address in Menan or a parcel number, or simply zoom in and click a tract close to Rigby. If the official address for the Jefferson County, ID map ever changes, our directory page carries the current link for Menan and the rest of the county.
Where Jefferson County land records are kept
Deeds and plats behind the Jefferson County map are kept by the county's recording office; the official Jefferson County website names which office that is. A deed book and page or instrument number on the county record is the quickest route to pull the document for a lot in Ririe.
Neighboring maps around Jefferson County
Near the edge of the county, check the next map over: Bingham County, Bonneville County, Butte County, Clark County, and Fremont County all border it. Every map bordering Jefferson County is listed on our Idaho directory.
What the flood zone letters mean
Any Jefferson County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, meaning FEMA estimates a 1-percent annual chance of flooding. A surveyor working near Ririe uses the base flood elevation printed for AE zones; unnumbered A zones don't have one. Land near Menan in shaded X (Zone B on older maps) sits in the moderate band between the 100-year and 500-year floods. Unshaded Zone X near Menan is minimal risk.
Low ground and small streams around Ririe
A creek near Menan that lists no detailed zone can still flood; FEMA says moderate- and low-risk areas still carry risk.
When the map affects a deal
Lenders watch the zone closely on Jefferson County properties. When a structure near Menan falls inside an A or V zone and carries a federally backed mortgage, the lender must require flood coverage, provided the community near Ririe takes part in the National Flood Insurance Program. For a county home in shaded or unshaded X, insurance is a choice, not a mandate; pricing a policy for land near Menan is still worth a call. Where a structure near Ririe looks higher than the shading suggests, the titleholder can ask FEMA for a Letter of Map Amendment (LOMA), supported by elevation data from a professional surveyor. Building or filling inside a mapped zone near Ririe generally needs a floodplain permit, and the building office serving Menan explains the steps.
From Rigby to the back roads
From Rigby, the seat of the county, the map spreads out to Lewisville, Menan, Mud Lake, and Ririe. Smaller places such as Grant, Hamer, and Heise appear on the Jefferson County map as little clusters of lots. Roughly 1,094 square miles of land and about 34,198 residents (2023 estimate) make up Jefferson County. Beyond the town lots in Lewisville, expect big rural parcels across the county. Jefferson County was organized in 1913, so deeds for older farms near Ririe can run back a long way.
Jefferson County, ID: common questions
Is my Rigby address in a flood zone?
Look it up at FEMA's Flood Map Service Center, then match the parcel lines in the Idaho statewide Parcels layer in ArcGIS Map Viewer; for land near Lewisville, a zone starting with A or V is high risk.
What does BFE mean on the flood map for Rigby?
For a Jefferson County property in Zone AE, the base flood elevation marks how high the 100-year flood is expected to rise, and it's printed in AE zones.
My lot in Rigby lists Zone AE. What does that mean?
Zone AE on a lot in Rigby is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
Does a 100-year floodplain near Lewisville flood only once a century?
No; land near Lewisville in the 100-year floodplain has a 1-percent chance of flooding every year, and two floods in one decade near Rigby are possible.
Is flood insurance required for a Zone X lot in Rigby?
Not under federal rules; Zone X in Jefferson County is outside the Special Flood Hazard Area, though a lender can still require coverage.
Does the Jefferson County parcel map display flood zones?
Check the layer list in the Idaho statewide Parcels layer in ArcGIS Map Viewer; if Jefferson County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Open the official Jefferson County, ID parcel map Jefferson 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.