Blog · October 14, 2026 · Illinois
Granite City Flood Zone Map, Illinois: a practical guide
Flood zones are set by FEMA, and checking one near Roxana takes a few minutes.
Main page: Madison County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Roxana? Checking the Granite City flood zone map reveals whether the lot falls inside a mapped floodplain, and the lookup is free. Covered here for Granite City: finding the address on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
Getting started with the Granite City flood zone map
Start with FEMA's Flood Map Service Center: search an address around Hartford, and choose the dynamic map. Vacant ground around South Roxana is still easy to locate: zoom in from Interstate 255 and click inside the land.
Getting to the right map
Go first to the Madison County parcel viewer; it covers every assessed parcel around South Roxana and Venice. If you only know roughly where the land is, follow Interstate 255 on the aerial and click the parcel itself. For a parcel near Glen Carbon, the record panel normally shows the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
Using it on a phone
Most viewers work in a phone browser, useful out on a road near Venice, so load it before you lose signal. A printout of the tract near Roxana helps when you meet an owner or agent.
Madison County in a few facts
Edwardsville holds the county offices, home to the main records offices. You'll also find Pontoon Beach, Venice, Hartford, and South Roxana, each with its own cluster of lots. Roughly 262,752 people call Madison County home (Census estimate, 2023) across some 716 square miles. The county was organized in 1812, which matters when you trace an old farm's title for land near Pontoon Beach. Features like Mississippi River and Horseshoe Lake make handy reference points on the map near South Roxana.
Granite City, IL: the basics
Granite City lies within Madison County, Illinois, which means parcel data comes from the county. For a tract near South Roxana, City or town hall handles matters such as zoning, permits and utilities within town limits, and the county still keeps the parcel and deed records. Land beyond the city limits out by Pontoon Beach often answers to county rules, not municipal ones.
A short flood checklist
Request for any Elevation Certificate on the property near South Roxana; an insurance quote early keeps the budget honest.
What the zone letters mean
An AE label carries a published BFE, and an unnumbered A zone has none; surveyors near Glen Carbon use that number. On ground around Venice, a low-risk label isn't a guarantee: FEMA notes that many claims come from moderate- and low-risk areas.
Beyond the mapped zones
Small streams around Glen Carbon may not have detailed mapping, so ask neighbors about past flooding. Wetlands near Pontoon Beach can limit building even outside a flood zone; check the National Wetlands Inventory mapper for a first look.
Use the county map alongside FEMA
FEMA doesn't draw property lines, so pair it with the Madison County parcel viewer for the outline of the tract near Glen Carbon.
What the map can't tell you
The acreage figure is a tax-roll number; just a licensed surveyor establishes the real corners for a parcel near Hartford. With a lot near Glen Carbon, records update in batches, so a deed recorded last month can take weeks to appear.
Insurance, lenders and building
Out toward Glen Carbon, ask for an Elevation Certificate: it records the building's elevation against the base flood. New construction in a floodplain near Roxana usually means extra permit review; call the permitting office before you plan.
Backing up the map with records
The map is an index, not the title: deeds, plats and easements covering ground around Glen Carbon sit with the county Recorder of Deeds (in many counties the County Clerk and Recorder). Inherited tracts around Venice can sit on several deeds, and a title company earns its fee on a real sale.
Next door to Madison County
Madison County borders Bond County, Clinton County, Jersey County, Macoupin County, and Montgomery County, and each of those keeps its own parcel map. A tract near the line by Venice may be split in two county records, so open the adjacent map as well. If the land is near Roxana, the Platbookmapper state page links each bordering county map across Illinois.
Frequently asked
What is a base flood elevation near Venice?
A BFE near Roxana tells builders how high the lowest floor should be; surveyors near Venice use it often.
Do I need flood insurance in Granite City?
Good question; for a building near Glen Carbon in an A or V zone with a federally backed or regulated mortgage, it's generally required; elsewhere it's optional.
Can I see flood zones on the county parcel viewer near Hartford?
It depends, but a flood layer may appear in the Madison County parcel viewer layer list, though it can lag behind FEMA's current panels.
Is AE a high-risk flood zone for land near South Roxana?
Generally, both are high-risk zones, but only AE has a base flood elevation, so builders near Venice design to that elevation.
Can I use the viewer in the field near Pontoon Beach?
No app is needed for most county viewers; load it before you lose coverage near Venice.
Open the official Madison 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.