Blog · October 14, 2026 · Montana
Broadwater County Flood Zone Map, Montana: a practical guide
The zone on FEMA's map affects insurance, building and resale near Canyon Ferry Lake.
Main page: Broadwater County, MT 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 Spokane Creek, pull up the Broadwater County flood zone map: FEMA's zone label affects insurance, building rules and resale. Covered here for Broadwater County: finding the address on FEMA's map, decoding A, AE and X, and matching it with the county parcel viewer.
Where the Broadwater County flood zone map lives
For parcel-by-parcel detail, try the National Flood Hazard Layer viewer, which draws the zones over aerial imagery, whether the land is near The Silos or elsewhere in the county. Rural land near Spokane Creek with no street number can still be found: zoom in from the nearest road then click the parcel area.
Getting to the right map
Parcels around Canyon Ferry Lake are published on the Montana Cadastral, free to use and open without a login. If the land is near Canyon Ferry Lake, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. For a parcel near Spokane Creek, save the parcel ID while you have it open; each office in the county uses it to find the file.
Taking the map into the field
Most viewers work in a phone browser, which helps when you're standing on land near Wheatland, though signal can drop in rural spots. A screenshot of the parcel near Spokane Creek with its ID keeps working without signal.
Which office to call
Questions about value or the owner field for land near The Silos go to the Montana Department of Revenue, the office behind the parcel record. Building or septic questions for a lot near The Silos go to planning, building or health offices, depending on whether the land is inside town limits.
Reading A, AE and X
For land near Canyon Ferry Lake, any A or V zone are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. For land near The Silos, minimal risk is not no risk: FEMA notes that floods happen outside mapped zones too.
Questions to ask before you buy
Ask the listing agent about past flood claims on the property near Spokane Creek; an insurance quote early keeps the budget honest.
Recorded documents worth pulling
Before you sign anything, pull the recorded deed from the County Clerk and Recorder; the parcel line is a drawing of it, whether the land is near Helena National Forest or elsewhere in the county. Closer to Helena National Forest, bring the document number shown in the record panel to skip a name search.
Lining it up with the parcel map
FEMA doesn't draw property lines, so pair it with the Montana Cadastral to see exactly which lot near The Silos you're looking at.
Lenders and permits
If the land is near Townsend, ask for an Elevation Certificate: it compares the building to the BFE. Building or adding on near Wheatland in a mapped zone can trigger elevation rules; call the permitting office early.
Water near Radersburg
Low-lying fields near Radersburg may not have detailed mapping, so ask neighbors about past flooding. Wetlands near Townsend can limit building even outside a flood zone; check the National Wetlands Inventory mapper for a first look.
Limits of the parcel data
The acreage figure is an estimate; only a licensed surveyor sets the real boundary on land around Helena National Forest. Out toward Wheatland, records update in batches, so a deed recorded last month may not show yet.
Next door to Broadwater County
Broadwater County meets Gallatin County, Jefferson County, Lewis and Clark County, and Meagher County; every one of them runs a separate parcel map. A tract near the line by Spokane Creek can be split across two assessors' files, so open the neighboring map too. Closer to Canyon Ferry Lake, The Platbookmapper state page lists every bordering county map for Montana.
Broadwater County in a few facts
Townsend serves as the county seat, which is where the courthouse records live. Smaller places on the map include Radersburg, Spokane Creek, The Silos, and Toston, each with its own cluster of lots. Around 8,032 people call Broadwater County home (Census Bureau estimate, 2023) across some 1,192 square miles. Broadwater County was organized in 1897, so old deeds can run back a long way. Features like Canyon Ferry Lake and Helena National Forest are easy to spot when you zoom out.
Questions about the Broadwater County flood zone map
How often are flood maps updated for land near The Silos?
Short answer: a new study can move a zone line near Helena National Forest; your community is notified before changes take effect.
Where do I find the BFE for a lot near Helena National Forest?
The BFE is printed in AE zones on FEMA's map; surveyors near Canyon Ferry Lake use it often.
Can I see flood zones on the Montana Cadastral around Spokane Creek?
A flood layer may appear in the Montana Cadastral layer list; confirm a lot near Spokane Creek on FEMA's map either way.
What does an AE label mean for a lot near Canyon Ferry Lake?
Good question; both are high-risk zones, but only AE has a base flood elevation, so builders near Radersburg design to that elevation.
Where do I ask about an assessment near Spokane Creek?
If the land is near The Silos, values are the Montana Department of Revenue's job; recorded documents belong to the County Clerk and Recorder, while zoning questions go to planning
Open the official Broadwater County, MT 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.