Blog · October 14, 2026 · Illinois
The Rock Island County Flood Zone Map: an Illinois guide
Look up any Rock Island County address on FEMA's flood map, read the zone, and match it to the parcel record for land around Silvis.
Main page: Rock Island County, IL GIS & Parcel Viewer (official map link, Rock Island County facts and neighboring maps).
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A Rock Island County flood zone map check belongs in the due diligence for any Rock Island County property, from a house lot in Coal Valley to farm ground near Moline. Here's how to read FEMA's map for a Rock Island County, IL property and match it to the parcel record.
Next: FEMA's search tool, the zone labels you'll see for Rock Island County, and how the parcel record confirms which tract you're on.
Where to see the official Rock Island County flood zone map
FEMA's official flood maps for Rock Island County are free at the FEMA Flood Map Service Center. Download the FIRM panel FEMA lists as effective for that part of Rock Island County. If the PDF panel for Rock Island County is hard to read, the National Flood Hazard Layer viewer is easier to use, which displays how much of a Rock Island County parcel sits inside the zone. Next, the Rock Island County parcel viewer confirms which Rock Island County parcel you're looking at. Laying the county parcel outline beside the FEMA shading displays if a homesite near Andalusia sits above or inside the zone.
Finding the tract on the Rock Island County map
The county's own public map is the Rock Island County parcel viewer, and it opens without an account for parcels in Moline and the rest of the county. Most people locate their Rock Island County tract fastest by searching an address in Coal Valley, then clicking the outline. For a backup route to the map covering Coal Valley, our Rock Island County directory entry keeps the link current.
Zone A, AE and X in plain English
On the FIRM covering Rock Island County, zones that start with A or V are Special Flood Hazard Areas, meaning FEMA estimates a 1-percent annual chance of flooding. Where a Rock Island County tract displays Zone AE, there's a base flood elevation to compare a building against; in Zone A there isn't one. Shaded Zone X around East Moline sits in the moderate band between the 100-year and 500-year floods. Clear, unshaded X near East Moline is outside the 500-year floodplain.
Where water shapes land in Rock Island County
In Rock Island County, look closest at tracts along Upper Mississippi River National Wildlife and Fish Refuge. Waterfront and bottomland parcels near East Moline frequently carry a zone along one edge, so check where the buildable part sits. A low spot on a Rock Island County tract outside any mapped zone, so treat an unmapped channel as a reason to ask questions, not proof the ground stays dry.
Questions to ask before buying in Rock Island County
Request any past flood claims history for a Rock Island County property before closing; it tells you more than the map alone. Then call an insurance agent who writes policies around Moline and get a quote using the zone and the county parcel address.
Flood insurance and building rules in Rock Island County
Here's why the zone matters at a closing in East Moline. Where a building in East Moline is mapped in a high-risk zone and is financed by a regulated or federally insured lender, federal rules call for flood insurance; that applies where the local government around Andalusia is in the National Flood Insurance Program. In Zone X near East Moline, coverage is optional, although some lenders require it anyway. If a building near Andalusia sits above the flood line, a Letter of Map Amendment request is the formal route, most frequently backed by an elevation certificate from a surveyor who works in the county. Building or filling inside a mapped zone near East Moline frequently requires a permit and an elevation check, so call the county or the town office in East Moline before work starts.
Rock Island County, IL: common questions
What does BFE mean on the flood map for Silvis?
For a county property in Zone AE, it's the projected water surface in the base flood, and a surveyor compares the building near Silvis to it.
Do I need a permit to build in the floodplain near Silvis?
Building in a Special Flood Hazard Area near Silvis most frequently needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
Is there a floodplain layer in the Rock Island County parcel viewer?
Look for a flood or floodplain layer in the Rock Island County viewer, then verify the zone with FEMA.
What does 100-year flood mean for Rock Island County land?
No; land near Andalusia in the 100-year floodplain carries a 1-in-100 chance in any single year, so floods can come in back-to-back years.
Where do I get an elevation certificate in Rock Island County?
A licensed land surveyor or engineer prepares it, and the building office serving Silvis may already have one on file for newer construction.
Open the official Rock Island County, IL parcel map Rock Island 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.