Blog · October 14, 2026 · Illinois
Jersey County Flood Zone Map, Illinois: a practical guide
Flood zones are set by FEMA, and checking one near Two Rivers National Wildlife Refuge takes a few minutes.
Main page: Jersey County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Delhi? A quick look at the Jersey County flood zone map shows whether FEMA puts it in a high-risk zone, and it costs nothing to check. Covered here for Jersey County: finding the address on FEMA's map, reading the zone codes, and pairing it with the Jersey County ArcGIS parcel map.
Checking the Jersey County flood zone map step by step
If you'd rather pan and zoom, use the National Flood Hazard Layer viewer, which draws the zones over aerial imagery, whether the land is near East Newbern or elsewhere in the county. Rural land near Otterville with no street number is still easy to locate: zoom in from US Route 67 then click the parcel area.
The free map to start with
Go first to the Jersey County ArcGIS parcel map; it maps each assessed parcel from Elsah to Fidelity. If you only know roughly where the land is, pan along US Route 67 until the lines appear, then click inside the one you want, and that holds around Beltrees too. Closer to Pere Marquette State Park, copy the parcel ID from that panel; every clerk in the county will want it.
Field tips
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Otterville, so load it before you lose signal. A screenshot of the parcel near Delhi with its ID helps when you meet an owner or agent.
Sections, lots and bearings
Illinois is laid out under the Public Land Survey System, so rural legal descriptions near Chautauqua cite section, township and range. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though sections near Otterville can be irregular. Keep the legal description for land near Dow before you request a deed or survey.
Neighboring parcel maps
The county meets Calhoun County, Greene County, Macoupin County, Madison County, and St. Charles County, MO; every one of them runs a separate parcel map around Beltrees. Acreage along the edge near Pere Marquette State Park can show up across two assessors' files, so open the neighboring map before you assume the acreage. If you're looking near Otterville, the Platbookmapper state page lists each neighboring county map across Illinois.
Zones on the Jersey County flood zone map
An AE label includes a base flood elevation (BFE), and an unnumbered A zone has none; that elevation drives building rules near Pere Marquette State Park. For land near Otterville, shaded Zone X is moderate risk, roughly the 100- to 500-year range; unshaded X is minimal risk.
Water near Dow
Low-lying fields near Chautauqua may not have detailed mapping, so ask neighbors about past flooding. Marshy spots near Brighton can limit building too; check the National Wetlands Inventory mapper for a first look.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so check the Jersey County ArcGIS parcel map too to see exactly which lot near Dow you're looking at.
What a flood zone means for a buyer
If a building sits in a Special Flood Hazard Area and a federally regulated lender is involved, the lender will require flood insurance in communities in the NFIP, which applies near Brighton as much as anywhere. Building or adding on near Beltrees in a mapped zone can trigger elevation rules; ask the local floodplain administrator early.
Backing up the map with records
Before you sign anything, get the recorded deed through the county Recorder of Deeds (in many counties the County Clerk and Recorder); the parcel map near Dow only summarizes it. Long-held tracts near Beltrees may go back through several deeds, and a title company earns its fee before a purchase.
Questions to ask before you buy
On ground around Grafton, request whether the home has flooded before closing; an insurance quote early keeps the budget honest.
Getting answers from the right desk
If the acreage or value on a parcel near Beltrees looks off belong with the Supervisor of Assessments, working with township assessors, the office behind the parcel record. Building or septic questions for a lot near Dow need the planning or permitting office, town or county, depending on location.
Quick answers
What is the difference between Zone A and AE near Beltrees?
In most cases, an AE zone has a 1% annual chance of flooding and a base flood elevation, which shapes building rules near Beltrees.
Is flood insurance mandatory near Grafton?
For most people, for a building near Otterville in an A or V zone with a federally backed or regulated mortgage, it's generally required; elsewhere it's optional.
How often are flood maps updated around Grafton?
With a lot near Fidelity, FEMA revises flood maps panel by panel as new studies finish; check the effective date on the panel.
Does the county parcel map show flood zones in Jersey County?
It depends, but a flood layer may appear in the county ArcGIS parcel map layer list; confirm a lot near Brighton on FEMA's map either way.
What's the tax parcel number used for around Two Rivers National Wildlife Refuge?
It's the number the Supervisor of Assessments, working with township assessors uses to track a tract near Otterville, and it's on the record panel and tax bills.
Open the official Jersey County, IL 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.