Blog · October 14, 2026 · Montana
Madison County Flood Zone Map (Montana)
Look up any Madison County address on FEMA's flood map, read the zone, and match it to the parcel record for land around Twin Bridges.
Main page: Madison County, MT GIS & Parcel Viewer (official map link, Madison County facts and neighboring maps).
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Before you buy a house in Sheridan, add on to a barn near Ennis, or price a lot along the creek bottoms near Brandon, check the Madison County flood zone map. For any tract in Madison County, Montana, the answer affects insurance, permits and resale.
We'll cover finding a Madison County address on FEMA's map, what Zone A, AE and X mean, how the county viewer fits in, and what to do if the map looks wrong.
How to check the Madison County flood zone map
The authoritative source for a Madison County flood zone map is FEMA, so begin at the FEMA Flood Map Service Center. Search returns the effective FIRM panel for the spot in Madison County, plus any pending changes FEMA has posted. For an irregular lot near Virginia City, the National Flood Hazard Layer viewer is easier to use and reports the zone wherever you click near Twin Bridges. Switch to the Madison County ArcGIS parcel map and locate the same tract near Virginia City. If the Madison County viewer has a floodplain layer, treat it as a convenience copy and confirm on FEMA's map.
Step one: the free Madison County viewer
The county's own public map is the Madison County ArcGIS parcel map, built on an Esri ArcGIS web map, and it opens without an account for parcels in Twin Bridges and the rest of the county. The Madison County site displays a disclaimer before the map; click through to reach parcels near Twin Bridges. Use the search box for an address in Twin Bridges or a parcel number, or simply zoom in and click a tract near Virginia City. Bookmark our Madison County page too; it tracks the official Montana link if it moves and lists the maps around Twin Bridges.
High, moderate and minimal risk in Madison County
On the FIRM covering Madison County, zones that start with A or V are Special Flood Hazard Areas, meaning FEMA estimates a 1-percent annual chance of flooding. Zone AE near Virginia City means FEMA published a base flood elevation; plain Zone A means no detailed elevation was studied. Land near Virginia City in shaded X (Zone B on older maps) sits in the moderate band between the 100-year and 500-year floods. Unshaded X (or C) on the Madison County panel means minimal risk.
Unmapped creeks in Madison County
A low spot on a Madison County tract outside any mapped zone can still flood; FEMA says moderate- and low-risk areas still carry risk.
Insurance, permits and map changes
Insurance is the practical stake for a Madison County buyer. Where a building in Twin Bridges is mapped in a high-risk zone and secures a loan from a federally regulated or insured lender, flood insurance is mandatory, as long as Madison County or the town participates in the NFIP. For a Madison County home in shaded or unshaded X, federal rules do not require a policy, although a lender in Montana can still ask for it. When a Madison County homesite is on a rise inside a mapped zone, FEMA's LOMA process allows a review, supported by elevation data from a licensed surveyor. Building or filling inside a mapped zone near Twin Bridges often requires a permit and an elevation check, so call the county or the town office in Twin Bridges before work starts.
Tracts that cross the Madison County line
A farm near the county line can carry separate records in Fremont County, ID, Beaverhead County, and Gallatin County as well. Our Montana page links each map neighboring Madison County.
Madison County flood zones questions
Who prepares an elevation certificate for a house in Ennis?
A licensed surveyor or engineer prepares it, and the building office serving Ennis may already have one on file for newer construction.
How do I know if a property in Madison County is in a flood zone?
FEMA's free map service covers Madison County: enter the address or pan to the tract near Sheridan, then note the zone label.
How do I challenge a flood zone for a lot in Ennis?
FEMA reviews requests such as a LOMA for Madison County properties; start with an elevation certificate.
Do I need a permit to build in the floodplain near Ennis?
Building in a Special Flood Hazard Area near Ennis typically needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
What does BFE mean on the flood map for Ennis?
On the map covering Ennis, it's the projected water surface in the base flood; elevation certificates in Madison County are measured against it.
Is flood insurance required for a Zone X lot in Ennis?
FEMA does not require it for a Zone X lot in Ennis, but coverage is available and some lenders ask for it.
Open the official Madison County, MT parcel map Madison 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.