9 flood insurance claims·$223,031 paid·4 federal flood & hurricane disasters
Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.
Shaded areas are FEMA’s mapped flood hazard zones in and around Sanders County, Montana. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.
Prolonged river flooding dominates the flood history of Sanders County, Montana, accounting for 24 out of 25 recorded flood events over the past 30 years compared to just one flash flood.
Historical events illustrate how seasonal weather patterns drive these conditions. In May 2018, snowpack measuring up to 200 percent of normal combined with above-normal temperatures to produce widespread flooding across western Montana. More recently, an atmospheric river event brought record precipitation and catastrophic rain-on-snow flooding to the region between December 6 and 12, 2025.
Federal insurance claims data reflects this geographic risk distribution. Properties located in FEMA Zone A should pay the most attention, accounting for 5 recorded claims with an average payout of $73,820 and an average recorded water depth of 1 inch. By comparison, Zone X_UNSHADED properties recorded 4 claims with an average payout of $786 and an average recorded water depth of 6 inches.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
In flood insurance claims here that reported a flood depth, the average was 5 inches.
Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.
Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.
3 NOAA storm reports from Sanders County describe what happened, in the words of the forecasters who covered it. Read the Montana flood stories →
15 federal disaster declarations since 1974, 4 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Severe Storms And Flooding | Dec 10, 2025 |
| River Road East Fire | Aug 18, 2023 |
| Highway 200 Fire Complex | Sep 9, 2017 |
| Moose Peak Fire | Sep 9, 2017 |
| Ice Jams And Flooding | Mar 1, 2014 |
| Hurricane Katrina Evacuation | Aug 29, 2005 |
| Cherry Creek Fire -08/06/03 | Aug 10, 2003 |
| Mt - Northwestern Zone 1 Fire Complex | Aug 14, 2000 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
25 since 1996: 1 flash floods and 24 river or area floods.
| Event | Date | Damage |
|---|---|---|
| Flood | Dec 11, 2025 | $100,000 |
| Flood | May 24, 2018 | — |
| Flood | May 18, 2018 | — |
| Flood | May 11, 2018 | — |
| Flood | Mar 19, 2017 | — |
| Flood | Mar 7, 2014 | $4,000 |
| Flash Flood | Aug 2, 2010 | $15,000 |
| Flood | Nov 7, 2006 | — |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Flood · Dec 11, 2025. Record precipitation fell as a prolonged atmospheric river event gripped the region from December 6 through 12. Much like a garden hose being moved back and forth, the jet stream shifted the focus of this moisture plume across the Pacific Northwest, repeatedly drenching parts of northern Idaho and western Montana. Between December 10 and 11, 2025, the atmospheric river specifically focused on northwest Montana, an…
Flood · May 24, 2018. Above normal snowpack combined with a warmer than normal month of May contributed to flooding across western Montana.
Flood · May 18, 2018. Above normal snowpack combined with a warmer than normal May contributed to flooding across western Montana.
Flood · May 11, 2018. Snow pack up to 200 percent of normal combined with above normal temperatures contributed to flooding across western Montana.
National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.
Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.
If a building in Sanders County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.
Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.