Casper, WY Flood Zone Map
Last updated: August 2026
Casper faces flooding from the North Platte River, which flows through the city, and from mountain tributaries. Spring snowmelt from the surrounding ranges is the primary driver of seasonal flooding.
Natrona County has recorded 57 NFIP flood insurance claims since 1978, totaling $247K 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
208
Natrona County
Avg. Premium
$1,240/yr
Natrona County
NFIP Flood Insurance Claims: Natrona County
Properties in Natrona County have filed 57 NFIP flood insurance claims totaling $247K in payouts since 1978. The average claim payout is $4K.
Highest-Claim Years
1978
8 claims - $18K
2009
6 claims - $33K
1983
5 claims - $0
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced August 2026. See national claims data.
Flood Insurance Coverage: Natrona County
Only roughly 1 in 152 households in Natrona County carries NFIP flood insurance (0.7% of estimated households). With 29 recorded flood events and $9.9M in damage, most flood losses in this county are likely uninsured.
Penetration Rate
0.7%
roughly 1 in 152 households
Historical Claims Ratio
1 in 4
57 claims over 45+ years across 208 current policies
Avg. Claim Payout
$4,333
Per claim, county-wide since 1978
Historically, Natrona County has averaged 1 claim for every 4 active policies (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 Casper.
Not sure whether you're required to carry it? See do I need flood insurance?, or compare NFIP vs. private flood insurance.
Federal Flood Disaster History: Natrona County
Natrona County has been included in 2 federal flood-related disaster declarations.
These declarations affected communities across Natrona County, including Casper.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced August 2026.
Recorded Flood Events: Natrona County
NOAA has recorded 29 flood events in Natrona County since 1996, causing $9.9M in damage.
Costliest Events
Events by Type
Source: NOAA Storm Events Database, 1996-2026. Data sourced August 2026.
Flood Mitigation: Natrona County
FEMA has funded mitigation for 71 properties in Natrona County, investing $0 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: Casper
The USACE National Levee Database lists 2 levee systems protecting parts of Casper. 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.
City Of Casper/Garden Creek Right
Non-AccreditedProtects against: Garden Creek - Sponsor: Private Landowner - 0.02 sq mi protected
City Of Casper/Garden Creek Left
Non-AccreditedProtects against: Garden Creek - Sponsor: Private Landowner - 0.02 sq mi protected
Source: USACE National Levee Database. Data sourced August 2026. Learn how levees affect flood zone mapping.
FEMA Flood Risk Profile: Natrona 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: $18.7M
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
What Your Flood Zone Means in Casper
Casper 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 Casper are Zone AE, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $18.7M.
Riverine flood risk in Casper 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 Casper address.
Casper, WY Flood Zone FAQ
What flood zones are in Casper, WY?
The most common FEMA flood zones in Casper are Zone AE, 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 Casper?
If your Casper 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 Casper?
Enter your Casper 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.
What type of flooding affects Casper?
Casper is primarily affected by river and stream overflow during heavy rainfall. The most common FEMA flood zone designations are Zone AE, Zone X. Use the free lookup tool above to check the specific flood zone for any Casper address.
Has Casper experienced major flooding events?
Natrona County, where Casper is located, has been part of 2 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Flooding in 2023. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Casper?
Natrona County has recorded 57 NFIP flood insurance claims totaling $247K in payouts since 1978. The year with the most claims was 1978, with 8 claims and $18K in payouts. These figures cover all NFIP claims in the county, including Casper.
How many flood insurance policies are there in Casper?
Natrona County had 208 NFIP flood insurance policies written or renewed over the trailing 13 months, with an average annual premium of $1,240. The most policies are in Zone AE (91 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.
Is Casper protected by a levee?
Yes. The USACE National Levee Database lists 2 levee systems protecting parts of Casper. 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 Casper 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 Casper?
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 Casper'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.
Understanding Flood Zones
See the Flood Map for Any Casper, WY Address
Enter a Casper, WY 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.