Blog · October 14, 2026 · Texas
Harrison County Flood Zone Map (Texas)
FEMA's free flood maps and the Harrison County parcel viewer, used together for property near Hallsville.
Main page: Harrison County, TX GIS & Parcel Viewer (official map link, Harrison County facts and neighboring maps).
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A Harrison County flood zone map check belongs in the due diligence for any Harrison County property, from a house lot in Uncertain to farm ground near Hallsville. FEMA's free Flood Map Service Center and the Harrison County parcel viewer answer it together.
Next: FEMA's search tool, the zone labels you'll see for Harrison County, and how the parcel record confirms which tract you're on.
How to check the Harrison County flood zone map
Open the FEMA Flood Map Service Center and type a county street address, say one in Uncertain. Download the FIRM panel FEMA lists as effective for that part of Harrison County. For an interactive view of the county, try FEMA's National Flood Hazard Layer viewer, so you can see if the shading reaches a house near Waskom. Switch to the Texas county CAD map and locate the same parcel near Waskom. The Harrison County record gives the parcel number and legal description that an insurer or lender near Uncertain may ask for.
Step one: the free Harrison County viewer
For land around Hallsville, open the Texas county CAD map (the ProdigyCAD maps portal); it's the map Harrison County itself publishes. Search the county appraisal map by owner, address or property ID; the pop-up for a parcel near Longview lists the account and legal description. For a backup route to the map covering Hallsville, our Harrison County directory entry keeps the link current.
Reading the zones on a Harrison County flood map
Any Harrison County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, defined by a 1-percent annual chance of being flooded. A surveyor working near Uncertain uses the base flood elevation printed for AE zones; unnumbered A zones don't have one. Land near Waskom in shaded X (Zone B on older maps) falls between the base flood and the 500-year flood. Unshaded Zone X near Waskom is minimal risk.
Low ground and small streams around Uncertain
A low spot on a Harrison County tract outside any mapped zone, which is why it's worth walking the ground after a heavy rain.
Flood insurance and building rules in Harrison County
The zone lists up again when a loan on a house near Waskom is underwritten. If a house near Waskom is mapped in a high-risk zone and carries a federally backed mortgage, a flood policy becomes a loan condition under the Flood Disaster Protection Act, wherever the community joins the NFIP. Outside the A zones around Waskom, insurance is a choice, not a mandate; pricing a policy for land near Waskom is still worth a call. Where a structure near Uncertain looks higher than the shading suggests, a Letter of Map Amendment request is the formal route; a surveyor near Waskom can supply the elevation data. Building or filling inside a mapped zone near Uncertain commonly requires a permit and an elevation check, so call the county or the town office in Uncertain before work starts.
Questions to ask before buying in Harrison County
For a house near Uncertain, ask the seller for any elevation certificate on file and the current flood insurance declarations page. Quotes for land near Karnack depend on the zone and the building's elevation, so bring both to the agent.
Floodways and restudies near Uncertain
Look at the effective date printed on the county panel, since a new study can redraw zones around Longview. A floodway on a county panel marks the part of the floodplain that carries the main flow, and it's treated more strictly than the rest of the zone near Karnack.
Neighboring maps around Harrison County
Near the edge of the county, check the next map over: Caddo Parish, LA, Gregg County, Marion County, Panola County, and Rusk County all border it. Our Texas page links each map neighboring Harrison County.
Harrison County, TX: common questions
Is flood insurance required for a Zone X lot in Marshall?
Not under federal rules; Zone X in Harrison County is outside the Special Flood Hazard Area, though a lender can still require coverage.
What does BFE mean on the flood map for Marshall?
On the map covering Marshall, it's the projected water surface in the base flood, and it's printed in AE zones.
Do I need a permit to build in the floodplain near Marshall?
Often, but local floodplain rules apply; ask the county or town building office in Marshall before you buy.
How do I challenge a flood zone for a lot in Marshall?
For a lot in Marshall, hire a surveyor for an elevation certificate, then file a LOMA request with FEMA.
What does Zone AE mean on a Harrison County flood map?
Yes, a parcel near Waskom in Zone AE is high risk: a 1-percent-annual-chance floodplain where FEMA lists a base flood elevation.
Open the official Harrison County, TX parcel map Harrison 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.