Blog · October 14, 2026 · Iowa
Using the Monona County Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near Castana.
Main page: Monona County, IA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Before you buy or build near Castana, look at the Monona County flood zone map: FEMA's zone label affects insurance, building rules and resale. This Monona County guide covers: finding the address on FEMA's map, decoding A, AE and X, and pairing it with the Monona County Beacon site.
The Monona County flood zone map: start here
With a lot near Albaton, the official source is FEMA's Flood Map Service Center: enter the street address, and choose the dynamic map. A tract near Blencoe without an address is still easy to locate: pan from the closest town and click inside the land.
The viewer Monona County publishes
Go first to the Monona County Beacon site; it maps each assessed parcel around Onawa and Mapleton. For acreage around Rodney, put in a street address, an owner's name or a parcel number, then pick the result to center the map on it. With a lot near Mapleton, save the parcel ID from that panel; every clerk in the county will want it.
Reading A, AE and X
For a parcel near Blencoe, zones beginning with A or V mark the Special Flood Hazard Area, land with a 1-percent chance of flooding in any year. For property near Albaton, minimal risk is not no risk: FEMA notes that floods happen outside mapped zones too.
Getting your bearings
Onawa is the county seat, home to the main records offices. You'll also find Blencoe, Castana, Mapleton, and Moorhead, each with its own cluster of lots. About 8,493 people call Monona County home (Census estimate, 2023) across some 694 square miles. The county was formed in 1851, and some chains of title near Ticonic are long.
When a parcel crosses a boundary
Monona County meets Crawford County, Harrison County, Ida County, Woodbury County, and Burt County, NE, all with their own assessor records. Ground near Castana that runs to the line can show up across two assessors' files, so look at the neighboring map as well. Around Blencoe, the Platbookmapper state page lists every bordering county map across Iowa.
What to request from a seller
If you're looking near Preparation, ask the listing agent for any Elevation Certificate before closing; an insurance quote early avoids surprises.
Low spots and local drainage
Small streams around Blencoe may not have detailed mapping, so walk the land after rain. Wetlands near Albaton can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
On site with the map
Most viewers work in a phone browser, useful out on a road near Moorhead, so load it before you lose signal. A printout of the tract near Moorhead helps when you meet an owner or agent.
Lining it up with the parcel map
Where a floodplain cuts across acreage near Preparation, the structure's footprint is the key question.
Recorded documents worth pulling
Before you sign anything, pull the recorded deed from the County Recorder; the viewer just points to it, which applies near Mapleton as much as anywhere. For property near Soldier, use the instrument number shown in the record panel to skip a name search.
What a flood zone means for a buyer
If a building sits in a Special Flood Hazard Area and the loan is federally backed or regulated, flood insurance is generally required in communities in the NFIP, for land near Rodney included. Building or adding on near Moorhead in a mapped zone often needs a floodplain permit; call the permitting office before you plan.
Legal descriptions in Iowa
Iowa follows the Public Land Survey System, so deeds around Blencoe reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though corrections make some sections near Albaton odd-sized. Copy the legal description from the record for the parcel near Preparation when you talk to a surveyor.
Getting answers from the right desk
Questions about value or the owner field for land near Albaton are handled by the County Assessor, the office behind the parcel record. Building or septic questions for a lot near Castana go to planning, building or health offices, depending on whether the land is inside town limits.
Frequently asked
Is AE a high-risk flood zone for land near Ticonic?
Out toward Ticonic, an AE zone has a 1% annual chance of flooding and a base flood elevation; unnumbered A zones don't list one.
Is my property near Rodney in a flood zone?
Good question; look up the spot near Soldier in FEMA's National Flood Hazard Layer viewer; then confirm the parcel on the county viewer.
What is a LOMA near Ticonic?
With a lot near Albaton, a Letter of Map Amendment (LOMA) from FEMA can remove a structure on naturally high ground; it starts with an elevation survey.
Is Zone X safe from flooding for land near Rodney?
If the land is near Albaton, shaded X is moderate risk and unshaded X is minimal risk; FEMA notes that a large share of claims come from these areas.
Why do offices ask for the parcel ID near Soldier?
It's the number the County Assessor uses to track a tract near Moorhead; copy it before you call anyone.
Open the official Monona County, IA 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.