Blog · October 14, 2026 · Illinois
Boone County Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Candlewick Lake takes a few minutes.
Main page: Boone County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before you buy or build near Candlewick Lake, pull up the Boone County flood zone map: the zone on that map shapes insurance, permits and resale. Covered here for Boone County: locating a parcel on FEMA's map, decoding A, AE and X, and pairing it with the Boone County ArcGIS parcel map.
The Boone County flood zone map: start here
If you'd rather pan and zoom, open the National Flood Hazard Layer viewer, which lets you click a spot and read its zone, whether the land is near Garden Prairie or elsewhere in the county. A tract near Candlewick Lake without an address is still easy to locate: zoom in from Interstate 90 and click the spot.
Getting to the right map
The public parcel map for this area is the Boone County ArcGIS parcel map, and no login is needed to use it. In and around Garden Prairie, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. If the land is near Garden Prairie, write down the parcel ID while you have it open; every records desk in the county asks for it first.
Deeds, plats and who keeps them
Before you sign anything, request the recorded deed through the county Recorder of Deeds (in many counties the County Clerk and Recorder); the viewer just points to it, whether the land is near Belvidere or elsewhere in the county. Inherited tracts around Garden Prairie can go back through a long string of deeds, so a title company is worth hiring if money is changing hands.
Neighboring parcel maps
The county touches DeKalb County, McHenry County, Ogle County, Winnebago County, and Rock County, WI; every one of them runs a separate parcel map for land near Candlewick Lake. Acreage along the edge near Argyle may be split across two assessors' files, so check the adjacent map before you assume the acreage. For a home near Blaine, our state page links each neighboring county map across Illinois.
Low spots and local drainage
Low-lying fields near Belvidere aren't always studied in detail, so ask neighbors about past flooding. Marshy spots near Candlewick Lake can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
Reading A, AE and X
Closer to Herbert, zones beginning with A or V mark the Special Flood Hazard Area, land with a 1-percent chance of flooding in any year. For a parcel near Argyle, a shaded X area marks moderate flood hazard, roughly the 100- to 500-year range; unshaded X is minimal risk.
A quick look at the area
Belvidere holds the county offices, where most land records are kept. Other places on the map include Argyle, Candlewick Lake, Garden Prairie, and Blaine. About 53,202 people call Boone County home (Census Bureau estimate, 2023) on some 281 square miles. Boone County dates to 1836, which matters when you trace an old farm's title.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so check the Boone County ArcGIS parcel map too for the outline of the tract near Herbert.
What to request from a seller
In and around Candlewick Lake, ask the listing agent whether the home has flooded before closing; an insurance quote early keeps the budget honest.
What a flood zone means for a buyer
For property near Belvidere, get the Elevation Certificate if one exists: it records the building's elevation against the base flood. Building or adding on near Herbert in a mapped zone can trigger elevation rules; check with the county or town building office early.
Legal descriptions in Illinois
Illinois uses the Public Land Survey System, so rural legal descriptions near Candlewick Lake cite section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though sections near Belvidere can be irregular. Keep the legal description for land near Garden Prairie when you talk to a surveyor.
Using it on a phone
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Argyle, though signal can drop in rural spots. A screenshot of the parcel near Blaine with its ID keeps working without signal.
Boone County: common questions
Is AE a high-risk flood zone near Candlewick Lake?
For acreage around Garden Prairie, both are high-risk zones, but only AE has a base flood elevation; unnumbered A zones don't list one.
Where do I find the BFE for a lot near Herbert?
For a parcel near Argyle, the base flood elevation is the water level expected in the 1% annual chance flood, and an Elevation Certificate compares the building to it.
Is my property near Argyle in a flood zone?
Good question; look up the spot near Blaine in FEMA's National Flood Hazard Layer viewer; then confirm the parcel on the county viewer.
Can I see flood zones on the county ArcGIS parcel map near Belvidere?
In most cases, a flood layer may appear in the county ArcGIS parcel map layer list, though it can lag behind FEMA's current panels, at least around Candlewick Lake.
What's the tax parcel number used for for land near Candlewick Lake?
It's the number the Supervisor of Assessments, working with township assessors uses to track a tract near Blaine; you'll see it in the viewer and on tax statements.
Open the official Boone 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.