Blog · October 14, 2026 · Idaho
Blaine County Flood Zone Map, Idaho
Look up any Blaine County address on FEMA's flood map, read the zone, and match it to the parcel record for land around Carey.
Main page: Blaine County, ID GIS & Parcel Viewer (official map link, Blaine County facts and neighboring maps).
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Is that lot in Bellevue in a flood zone? The Blaine County flood zone map answer comes from FEMA, and it's free to look up. You can check it yourself for any Bellevue address in a few minutes.
Next: FEMA's search tool, the zone labels you'll see for Blaine County, and how the parcel record confirms which tract you're on.
How to use the Blaine County flood zone map
FEMA's official flood maps for Blaine County are free at the FEMA Flood Map Service Center. Download the FIRM panel FEMA lists as effective for that part of Blaine County. On acreage outside Sun Valley, FEMA's National Flood Hazard Layer viewer draws the zones over aerial imagery, which displays how much of a county parcel sits inside the zone. Then open the Idaho statewide Parcels layer in ArcGIS Map Viewer for Blaine County to confirm the parcel near Sun Valley. Match the Blaine County lines and acreage to the FEMA view, since flood maps do not draw property lines in detail.
Step one: the free Blaine County viewer
For Blaine County, the free public parcel layer is state-run: open the Idaho statewide Parcels layer in ArcGIS Map Viewer and pan to Bellevue. Most people find their Blaine County tract fastest by searching an address in Bellevue, then clicking the outline. Our Blaine County, ID page keeps the official link and the maps next door to Bellevue in one place.
Reading the zones on a Blaine County flood map
For a lot in Sun Valley, 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. Zone AE near Hailey means FEMA published a base flood elevation; plain Zone A means no detailed elevation was studied. If a Blaine County parcel displays shaded Zone X, it falls between the base flood and the 500-year flood. Unshaded X (or C) on the Blaine County panel means minimal risk.
Unmapped creeks in Blaine County
A low spot on a Blaine County tract outside any mapped zone, which is why it's worth walking the ground after a heavy rain.
A short buyer checklist for Carey
Request any past flood claims history for a Blaine County property before closing; it tells you more than the map alone. An agent working in Blaine County can quote flood coverage once you know the zone for the lot near Sun Valley.
Map dates and floodways in Blaine County
The FIRM panel for Blaine County carries an effective date; if it's old, ask the county floodplain office if new maps for land near Bellevue are in progress. 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 Galena.
When the map affects a deal
Insurance is the practical stake for a Blaine County buyer. When a county home is mapped in a high-risk zone and secures a loan from a federally regulated or insured lender, flood insurance is mandatory, provided the community near Sun Valley takes part in the National Flood Insurance Program. For a Blaine County home in shaded or unshaded X, insurance is a choice, not a mandate, although some lenders require it anyway. If a building near Hailey sits above the flood line, 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 Sun Valley has to meet local floodplain rules, and the building office serving Hailey explains the steps.
Quick answers for Blaine County
Where do I get an elevation certificate in Blaine County?
Hire a professional surveyor or engineer who works in Blaine County; ask the local floodplain office first in case one exists.
Can I see flood zones on the Blaine County GIS map?
Check the layer list in the Idaho statewide Parcels layer in ArcGIS Map Viewer; if Blaine County includes a floodplain layer, confirm the zone on FEMA's map anyway.
What is a base flood elevation for a Blaine County property?
On the map covering Ketchum, the BFE is the height floodwater is expected to reach in the 1-percent-annual-chance flood; elevation certificates in Blaine County are measured against it.
Is Zone AE near Sun Valley high risk?
Zone AE on a lot in Ketchum is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
What does 100-year flood mean for Blaine County land?
No; land near Sun Valley in the 100-year floodplain has a 1-percent chance of flooding every year, and two floods in one decade near Ketchum are possible.
Open the official Blaine County, ID parcel map Blaine 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.