Great Falls, MT Flood Zone Map
Last updated: August 2026
Great Falls lies along the Missouri River and faces flooding from spring snowmelt and heavy rainfall on the Rocky Mountain Front. The Sun River confluence adds to flood risk in the area.
Cascade County has recorded 257 NFIP flood insurance claims since 1978, totaling $855K in payouts. Explore the full NFIP claims data by state and county to see how this area compares nationally.
FEMA Region
Region 8
NFIP Policies
367
Cascade County
Avg. Premium
$1,147/yr
Cascade County
NFIP Flood Insurance Claims: Cascade County
Properties in Cascade County have filed 257 NFIP flood insurance claims totaling $855K in payouts since 1978. The average claim payout is $3K.
Highest-Claim Years
1981
60 claims - $99K
2011
46 claims - $212K
1997
41 claims - $67K
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced August 2026. See national claims data.
Flood Insurance Coverage: Cascade County
Only roughly 1 in 91 households in Cascade County carries NFIP flood insurance (1% of estimated households). With 30 recorded flood events and $380K in damage, most flood losses in this county are likely uninsured.
Penetration Rate
1%
roughly 1 in 91 households
Historical Claims Ratio
1 in 1
257 claims over 45+ years across 367 current policies
Avg. Claim Payout
$3,327
Per claim, county-wide since 1978
Historically, Cascade County has averaged 1 claim for every active policy (since 1978). This compares cumulative claims against today's policy count and does not predict future claim likelihood.
Coverage data: NFIP policies as of August 2026, claims since 1978 (August 2026), population from FEMA NRI. All figures are county-wide and include Great Falls.
Not sure whether you're required to carry it? See do I need flood insurance?, or compare NFIP vs. private flood insurance.
Repetitive Loss Properties: Cascade County
Cascade County has 4 properties with multiple flood insurance losses, including 0 severe repetitive loss properties. Severe repetitive loss is a subset of multiple loss, not a separate count. Data sourced August 2026.
Multiple Loss
4
2+ claims within 10 years
Severe Repetitive Loss
0
4+ claims or 2 exceeding value
Mitigated
0
Received FEMA mitigation
By Flood Zone
Source: OpenFEMA NFIP Multiple Loss Properties. Data sourced August 2026.
Flood Insurance Discount: Great Falls
Great Falls participates in FEMA's Community Rating System (CRS), a voluntary program that rewards communities for flood mitigation efforts beyond minimum NFIP requirements. Residents in the Special Flood Hazard Area may qualify for reduced flood insurance premiums.
CRS Class
Class 6
SFHA Premium Discount
20% off
CRS classes range from 1 (best) to 10 (no discount). Great Falls's Class 6 rating means NFIP policyholders in the SFHA can receive up to a 20% discount on their flood insurance premiums. Properties outside the SFHA may receive a 10% discount.
Source: FEMA Community Rating System, April 2026. Discounts apply to NFIP policies only.
Federal Flood Disaster History: Cascade County
Cascade County has been included in 3 federal flood-related disaster declarations.
These declarations affected communities across Cascade County, including Great Falls.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced August 2026.
Recorded Flood Events: Cascade County
NOAA has recorded 30 flood events in Cascade County since 1996, causing $380K in damage and 2 deaths.
Costliest Events
Events by Type
Source: NOAA Storm Events Database, 1996-2026. Data sourced August 2026.
Flood Mitigation: Cascade County
FEMA has funded mitigation for 1 properties in Cascade County, investing $54K in flood risk reduction. Common mitigation actions include acquisition (buying and demolishing flood-prone structures), elevation (raising buildings above flood level), and safe rooms (wind/storm shelters for tornado and hurricane protection).
By Action Type
Source: OpenFEMA Hazard Mitigation Assistance. Data sourced August 2026. FEMA records a total payment per grant rather than per property, so the dollar figure is an estimate that splits each grant across the properties it covers; the property count is exact.
Levee Protection: Great Falls
The USACE National Levee Database lists 1 levee system protecting parts of Great Falls. A system's FEMA accreditation status determines how its protected area is mapped: accredited levees are typically mapped as Zone X, while non-accredited or provisionally accredited systems generally leave their protected area in the Special Flood Hazard Area (often Zone AR or A99) until certification is complete.
Great Falls - Sun River LB
Provisionally AccreditedProtects against: Sun River - Sponsor: West Great Falls Flood Control and Drainage District - 2.29 sq mi protected
Source: USACE National Levee Database. Data sourced August 2026. Learn how levees affect flood zone mapping.
FEMA Flood Risk Profile: Cascade County
Based on FEMA's National Risk Index, which evaluates flood risk at the county level using historical loss data, exposure, and vulnerability.
Inland Flood Risk
Relatively ModerateEst. annual loss: $25.4M
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
What Your Flood Zone Means in Great Falls
Great Falls faces flood risk primarily from river and stream overflow during heavy rainfall, snowmelt, or upstream dam releases. When rivers exceed their banks, floodwaters spread across low-lying areas mapped in AE and A zones. The most common FEMA flood zone designations in Great Falls are Zone AE, Zone A, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $25.4M.
Riverine flood risk in Great Falls is driven by the proximity and elevation of properties relative to nearby waterways. Properties closer to rivers with lower ground elevations typically face higher flood insurance premiums under FEMA's Risk Rating 2.0. If your property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance.
River flood maps can change when FEMA conducts new Flood Insurance Studies or when development alters drainage patterns. Letters of Map Amendment (LOMA) can remove individual properties if the natural ground elevation was always above the Base Flood Elevation and the property was inadvertently mapped in the SFHA. Use our free lookup tool to check the current flood zone for any Great Falls address.
Great Falls, MT Flood Zone FAQ
What flood zones are in Great Falls, MT?
The most common FEMA flood zones in Great Falls are Zone AE, Zone A, Zone X. Properties in these high-risk zones (SFHA) may require flood insurance with a federally regulated or government-backed mortgage.
Is flood insurance required in Great Falls?
If your Great Falls property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance. Properties in Zone X are not federally required to carry flood insurance, though coverage is still recommended since about a quarter of all NFIP flood claims come from properties outside high-risk zones.
How do I check my flood zone in Great Falls?
Enter your Great Falls address in the search tool above for an instant flood zone determination. Results include your FEMA flood zone, SFHA status, base flood elevation (if available), and FIRM panel information, pulled directly from FEMA's National Flood Hazard Layer.
Does Great Falls offer flood insurance discounts?
Yes. Great Falls participates in FEMA's Community Rating System (CRS) with a Class 6 rating, qualifying residents in the Special Flood Hazard Area for up to a 20% discount on NFIP flood insurance premiums. Properties outside the SFHA may receive a 10% discount.
Has Great Falls experienced major flooding events?
Cascade County, where Great Falls is located, has been part of 3 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Hurricane Katrina Evacuation in 2005. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Great Falls?
Cascade County has recorded 257 NFIP flood insurance claims totaling $855K in payouts since 1978. The year with the most claims was 1981, with 60 claims and $99K in payouts. These figures cover all NFIP claims in the county, including Great Falls.
How many flood insurance policies are there in Great Falls?
Cascade County had 367 NFIP flood insurance policies written or renewed over the trailing 13 months, with an average annual premium of $1,147. The most policies are in Zone AE (272 policies). These are county-level counts of policies written or renewed in the trailing 13 months, not a point-in-time count of policies in force - a policy renewed inside that window is counted twice.
How many Great Falls properties have flooded repeatedly?
Cascade County has 4 properties with multiple flood losses on record, including 0 severe repetitive loss properties. These are properties that have experienced four or more NFIP claims of $5,000+ or two claims exceeding the building value.
Is Great Falls protected by a levee?
Yes. The USACE National Levee Database lists 1 levee system protecting parts of Great Falls (Great Falls - Sun River LB). None currently carry full FEMA accreditation, which typically keeps the protected area within the Special Flood Hazard Area (often Zone AR or A99) until the levee is certified. Levee protection is system-specific, not city-wide - check the address search above for the zone at a specific property.
Can my Great Falls property be removed from a high-risk flood zone?
Yes, if your property's natural ground elevation is above the Base Flood Elevation and FEMA inadvertently mapped it in a high-risk zone, you can apply for a Letter of Map Amendment (LOMA). A successful LOMA removes the property from the Special Flood Hazard Area, generally eliminating the federal mandatory flood insurance requirement. You will need an elevation certificate from a licensed surveyor. If a property was raised above the BFE with fill material, the process is a LOMR-F rather than a LOMA.
What is Base Flood Elevation in Great Falls?
Base Flood Elevation (BFE) is the predicted height of floodwaters during a 1% annual chance (100-year) flood, shown on FEMA maps as an elevation number in feet above sea level. In Great Falls's Zone AE areas, BFE lines appear on the FIRM as wavy contours labeled with elevation values. Properties with a lowest floor at or above the BFE typically qualify for significantly lower NFIP flood insurance premiums.
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Understanding Flood Zones
See the Flood Map for Any Great Falls, MT Address
Enter a Great Falls, MT address to view its FEMA flood map, zone designation, SFHA status, and insurance requirements.
Disclaimer: Flood risk data on this page is sourced from FEMA datasets including the National Risk Index, NFIP claims and policy records, disaster declarations, and the Community Rating System. These datasets were last extracted on August 2026 and may not reflect the most recent changes. Always verify current flood zone status through FEMA or a licensed determination provider before making property, insurance, or lending decisions.