Blog · October 14, 2026 · Texas
Sherman Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Pottsboro.
Main page: Grayson County, TX 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.
Weighing a property around Southmayd? The Sherman flood zone map tells you whether it sits in a FEMA flood zone, and it costs nothing to check. This Sherman guide covers: finding the address on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
Checking the Sherman flood zone map step by step
Start with FEMA's Flood Map Service Center: type an address near Knollwood, and choose the dynamic map. Vacant ground around Knollwood can still be found: zoom in from the nearest road and click the spot.
The free map to start with
Your first stop is the Grayson CAD interactive map; it maps each tax parcel from Knollwood to Howe. In and around Howe, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. For property near Dorchester, write down the parcel ID from that panel; every clerk in the county asks for it first.
Land on the county line
Grayson County touches Bryan County, OK, Love County, OK, Marshall County, OK, Collin County, and Cooke County; every one of them runs a separate parcel map. Ground near Pottsboro that runs to the line may be split in two county records, so check the adjacent map before you assume the acreage. For a parcel near Denison, our state page links every neighboring county map for Texas.
Sherman and the county around it
Sherman sits in Grayson County, Texas, which means parcel data comes from the county. As the county seat, Sherman hosts the courthouse, which puts the County Clerk close by. For a tract near Pottsboro, the municipality handles matters such as zoning, permits and utilities inside its limits, and the county still keeps the parcel and deed records. Land beyond the city limits out by Denison usually answers to county rules rather than the town's.
What the zone letters mean
For acreage around Pottsboro, any A or V zone are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. For a parcel near Dorchester, a low-risk label isn't a guarantee: FEMA notes that many claims come from moderate- and low-risk areas.
How land is described here
Tracts outside towns near Howe are often described by metes and bounds, which trace the boundary call by call. Town lots near Pottsboro are typically described by lot and block, making them easier to find. Keep the legal description for land near Southmayd before you request a deed or survey.
Recorded documents worth pulling
When the details count, get the recorded deed from the County Clerk; the parcel map near Knollwood only summarizes it. Long-held tracts near Southmayd can sit on several deeds, so a title company is worth hiring on a real sale.
Use the county map alongside FEMA
FEMA's map shows zones but not ownership, so pair it with the Grayson CAD interactive map to see exactly which lot near Southmayd you're looking at.
A quick look at the area
Sherman serves as the county seat, home to the main records offices. You'll also find Knollwood, Southmayd, Dorchester, and Howe, each with its own cluster of lots. Around 146,907 people call Grayson County home (Census Bureau estimate, 2023) across roughly 933 square miles. Grayson County dates to 1846, which matters when you trace an old farm's title. Features like Hagerman National Wildlife Refuge make handy reference points on the map near Pottsboro.
Lenders and permits
In and around Knollwood, an Elevation Certificate from a surveyor helps: it compares the building to the BFE. Building or adding on near Knollwood in a mapped zone can trigger elevation rules; ask the local floodplain administrator early.
Low spots and local drainage
Low-lying fields near Dorchester aren't always studied in detail, so walk the land after rain. Marshy spots near Pottsboro can limit building too; check the National Wetlands Inventory mapper for a first look.
What to request from a seller
Ask the listing agent about past flood claims on the property near Dorchester; an insurance quote early keeps the budget honest.
Getting answers from the right desk
Questions about value or the owner field for land near Pottsboro are handled by the appraisal district, which maintains the tax roll. Building or septic questions for a lot near Dorchester need the planning or permitting office, depending on whether the land is inside town limits.
Questions about the Sherman flood zone map
What if the flood map is wrong for my lot near Dorchester?
It depends, but FEMA's LOMA process is the usual route when a building near Knollwood sits above the base flood elevation; a surveyor's elevation data supports it.
Do I need flood insurance in Sherman?
In most cases, for a building near Dorchester in an A or V zone with a federally backed or regulated mortgage, it's generally required; outside those zones it's your call.
Do I need to worry about flooding in Zone X in Sherman?
Good question; X zones around Howe are lower risk, not no risk; FEMA notes that a large share of claims come from these areas.
What is a base flood elevation in Sherman?
Short answer: a BFE near Southmayd tells builders how high the lowest floor should be; surveyors near Knollwood use it often.
Can I download parcel lines near Knollwood?
Most viewers have a print or export tool, and it's worth keeping the parcel ID visible for land near Dorchester.
Open the official Grayson County, TX 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.