Gillette, Wyoming Flood Zones
Gillette faces flash flooding from Donkey Creek and other drainages in the Powder River Basin. Intense thunderstorms in the semiarid terrain can produce rapid runoff and dangerous flash floods.
FEMA Flood Risk Profile: Campbell 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 LowEst. annual loss: $6.5M
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: Campbell County
Campbell County has been included in 1 federal flood-related disaster declaration.
These declarations affected communities across Campbell County, including Gillette.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: Campbell County
Properties in Campbell County have filed 22 NFIP flood insurance claims totaling $38K in payouts since 1978. The average claim payout is $2K.
Highest-Claim Years
1978
12 claims - $29K
1982
7 claims - $2K
2007
1 claims - $6K
Claims by Flood Zone
Zone X
7
Zone A
2
Zone D
1
Source: OpenFEMA NFIP Claims API. Data sourced February 2026.
Common Flood Zones in Gillette
Properties in Gillette, WY are commonly designated in these FEMA flood zones:
What Your Flood Zone Means in Gillette
Gillette faces multiple inland flood threats, including riverine flooding from nearby waterways and flash flooding from intense rainfall overwhelming urban drainage systems. Properties near river corridors face the highest risk, but stormwater backup can affect neighborhoods well outside the mapped floodplain. The most common FEMA flood zone designations in Gillette are Zone AE, Zone A, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $6.5M.
With both riverine and urban stormwater flood risk, insurance costs in Gillette depend heavily on a property's elevation relative to nearby waterways and the local drainage infrastructure. FEMA's Risk Rating 2.0 prices in multiple inland flood sources rather than relying on the flood zone line alone. 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.
Flood zone boundaries in Gillette can shift when FEMA updates its Flood Insurance Studies or when upstream development changes how water moves through the watershed. New stormwater infrastructure or dam modifications can also trigger map revisions. Use our free lookup tool to check the current flood zone for any Gillette address.
Check Your Gillette Address
Enter any Gillette, WY address to instantly see its FEMA flood zone, risk level, and whether flood insurance is required.
Free Flood Zone LookupGillette, WY Flood Zone FAQ
What flood zones are in Gillette, WY?
The most common FEMA flood zones in Gillette 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 Gillette?
If your Gillette 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 25% of all NFIP flood claims come from Zone X properties.
How do I check my flood zone in Gillette?
Enter your Gillette 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 Gillette?
Gillette is primarily affected by river overflow combined with urban drainage challenges. The most common FEMA flood zone designations are Zone AE, Zone A, Zone X. Use the free lookup tool above to check the specific flood zone for any Gillette address.
Has Gillette experienced major flooding events?
Campbell County, where Gillette is located, has been part of 1 federal disaster declaration for flooding, hurricanes, or severe storms. The most recent was Severe Storms, Flooding & Mudslides in 1978. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Gillette?
Campbell County has recorded 22 NFIP flood insurance claims totaling $38K in payouts since 1978. The year with the most claims was 1978, with 12 claims and $29K in payouts. These figures cover all NFIP claims in the county, including Gillette.
Sources
This page summarizes information from FEMA and other official resources in plain language. For full technical details, see the links below.
- FEMA National Flood Hazard LayerDirect Source
The NFHL is the source of all flood zone data shown on this page.
- FEMA Map Service Center — Search by AddressDirect Source
Look up any address to view FIRM panels, FIS reports, and LOMCs.
- NFHL Data and Map StatusTopic Page
View NFHL coverage and data freshness by state and community.
- FEMA National Risk Index — Data ResourcesDirect Source
County-level risk scores for inland flooding, coastal flooding, and hurricane used in the Flood Risk Profile.
- OpenFEMA Disaster Declarations Summaries API v2Direct Source
Federal disaster declarations filtered for flood-related incident types (Flood, Hurricane, Severe Storm, Coastal Storm).
- OpenFEMA FIMA NFIP Claims API v2Direct Source
Historical NFIP flood insurance claims since 1978, aggregated by county and state. Includes claim counts, payouts, and flood zone breakdowns.
Sources last verified: February 2026