Asotin County

Every large fire

1. Large fires mapped by the Monitoring Trends in Burn Severity program since 1984: 1,000 acres or more in the West, 500 or more in the East. Prescribed burns are excluded. Acres here are the part of each perimeter inside this place.

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service), 1984 to 2026.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

River crests

River gauges

1. Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.

NOAA National Water Prediction Service gauge records, retrieved October 30, 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

Every earthquake of magnitude 4 or more within 50 miles

1. Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
2. Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).

USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.

Mapped landslides

Mapped by WA WGS (21), NASA (2).

1. Landslides mapped in the USGS compilation of landslide inventories across the United States (version 3.0, 2025), rated probable or better. The compilation joins inventories made by federal and state agencies for different purposes and areas, so the number mapped in a county reflects how closely it has been surveyed as much as how often its slopes fail. An area with few records may simply not have been mapped. Deaths are as recorded in the inventories; a slide listed in two inventories is counted once.

USGS Landslide Inventories across the United States, version 3.0, retrieved October 27, 2026.

More event types since 1996

Costliest events since 1996

1. Jul 15, 2024Wildfire, Northeast Blue Mountains$35.0 million
   National Weather Service narrative

   The Cougar Creek Fire started July 15 from unknown cause. It burned 24091 acres of timber. The cost is estimated.

2. Apr 13, 2017Flash Flood$1.5 million
   National Weather Service narrative

   A Flash Flood closed Highway 129 near where Rattlesnake Creek meets the Grande Ronde River. The road was closed for three hours and then opened up to one lane of traffic.

3. Jul 17, 2026Wildfire, Northeast Blue Mountains$1.0 million
   National Weather Service narrative

   The wildfire was discovered around 1255 PST on July 17. It was located 7 miles southwest of Silcott. It was caused by lightning. It burned 2589 acres of grassland. It was contained on August 2. Cost is estimated.

4. Jun 5, 2022Flash Flood$110,000
   National Weather Service narrative

   Several roads were inundated with mud and rocks from flash flooding. Four basement apartments on 14th street were flooding. Another residence on Solar Hills Drive was flooded.

5. Sep 25, 1998Flash Flood$30,000
   National Weather Service narrative

   Over 0.75" fell over the Clarkston Valley causing flooding on the Interstate bridge and prompting to be closed for two hours. Several roads were also under about a foot of water.

6. Sep 8, 1998Flash Flood$30,000
   National Weather Service narrative

   Rainfall amounts of up to 0.87" fell over the Clarkston Valley, causing several streets to flood and mudslides closing roads.

7. Jun 5, 2022Thunderstorm Wind$20,000
   National Weather Service narrative

   Several trees and power lines down in Clarkston and Clarkston Heights. One incident involved power lines down onto a vehicle.

8. Jun 9, 2023Flash Flood$20,000
   National Weather Service narrative

   Flash flooding impacted several roads of Clarkston. Half an inch of rain fell in 15 minutes from 1330LST to 1345LST. Flooding also impacted on State Highway 129 between Asotin and Clarkston, with mud and debris on the roadway.

9. Jun 3, 2022Flash Flood$12,000
   National Weather Service narrative

   Asotin County Fire District observed minor flooding at McGuire Gulch where it crosses Asotin Creek Road and said his department received similar reports from the top end of the gulch near where it crosses Peola Road. At the button end of the gulch, Hardin said water entered a shop, flooded a field and surrounded barns.

10. Jun 8, 2009Thunderstorm Wind$10,000
    National Weather Service narrative

    Strong downburst winds from a thunderstorm knocked out power to 2,000 customers in Clarkston when a tree blew down on a power line. An addition, a portable carport was blown into another power line. Another tree was uprooted knocking down another power line and landing on a shop.

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

115°F2 times, most recently Jun 29, 2021

All-time low

−22°F2 times, most recently Dec 30, 1968

Warmest night

79°F2 times, most recently Jul 1, 2021

Coldest day

−8°FDec 30, 1968

Wettest day

1.80 inJul 10, 1998

Snowiest day

8.7 inJan 15, 1950

Hottest year

2015mean 56.4°F

Coldest year

1955mean 49.0°F

Wettest year

195018.72 in

Driest year

20077.73 in

Snowiest season

49.8 in1955-56

Station Lewiston Airport (USW00024149), 1,430 ft elevation, 2.7 miles from the population centre. Daily records from 1948 to October 26, 2026; 99.9% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USW00024149.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Landslides USGS Landslide Inventories across the United States, version 3.0 (2025).
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.