Foster County

Population 3,212 (2025) 634 sq mi

Foster County has recorded 17 tornadoes since 1950, 43rd most of 53 counties in North Dakota; the most recent was on June 28, 2025.

Hazard fingerprint for Foster County Tornado: 35th percentile. Tropical: 0th percentile. Wildfire: 0th percentile. Flood: 13th percentile. Hail & wind: 27th percentile. Heat: 13th percentile. Cold: 86th percentile. Winter: 75th percentile. TORTROPFIREFLOODSEVEREHEATCOLDWINTER

Hazard fingerprint Each spoke is this county’s percentile among U.S. counties where that hazard occurs. How it is computed

2026
  • Tornado damage paths since 195017

At a glance

The record for Foster County in eight numbers. Each links to its section below.

Tornadoes since 1950

17

43rd of 53 in North Dakota

Fewer than the typical North Dakota county, which has had 27

Details

Flood insurance claims

11

29th of 53 in North Dakota

$98,000 paid since 1997

Details

Strongest tornado

F2

July 29, 1972, 2.3 mile path

Federal disaster declarations

23

Most recent: Severe Storm, Tornadoes, and Straight-Line Winds, 2025

Details

Record high

107°F

Reached 2 times, most recently August 7, 1983

Details

Record low

−39°F

February 1, 1996

Details

Snowiest season

118.3in

Winter of 2022-23

Costliest event since 1996

$10.0M

Thunderstorm Wind, June 25, 1999

Details

Tornadoes

About one every 4.5 years since 1950, none rated F3/EF3 or stronger.

Strongest

July 29, 1972

F2, 2.3 mile path

20 yards wide.

Most recent

Saturday, June 28, 2025

EFU, 0.5 mile path

Within the past year.

Tornadoes by decade Doppler radar era² 1950s: 0 1960s: 1 1 1970s: 3 3 1980s: 2 2 1990s: 4 4 2000s: 1 1 2010s: 3 3 2020s: 3 3 1950s1960s1970s1980s1990s2000s2010s2020s
Recorded tornadoes per decade. The 2020s are incomplete.
Tornadoes by month J: 0 F: 0 M: 0 A: 0 M: 2 J: 7 7 J: 6 A: 2 S: 0 O: 0 N: 0 D: 0 JFMAMJJASOND
By month of occurrence, all years.

Every recorded tornado

Tornadoes in Foster County since 1950
Jun 28, 2025EFU0.55000
Jun 28, 2025EFU0.75000
Jun 20, 2025EF15.815000
May 30, 2018EF00.95000
Jul 17, 2011EF00.02000
Jul 17, 2011EF01.53000
Jun 27, 2003F00.03000
Aug 18, 1994F12.04000
Aug 18, 1994F12.04000
Jun 21, 1993F00.11000
Jun 21, 1993F00.11000
Jul 21, 1987F10.21000
May 15, 1982F00.11000
Jul 23, 1977F00.11000
Jun 26, 1977F10.11000
Jul 29, 1972F22.32000
Jul 5, 1963F00.11000
  1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Foster County: 0.
  2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Hurricanes and tropical storms

No tropical storm or hurricane has tracked within 100 miles since records began in 1851.

Wildfire and smoke

No large wildfire has been mapped here since satellite mapping began in 1984.

Smoke overhead

Smokiest year

2023: 77 days

Heavy smoke on 40 days in 2021, the most of any year.

Last 10 years

35.5 days a year

Medium or heavy smoke, 2016 to 2025.

2025

30 days

Medium or heavy smoke. 45 so far in 2026.

Days with medium or heavy smoke overhead, by year 2011: 5 2012: 23 2013: 12 2014: 17 2015: 29 2016: 13 2017: 23 2018: 35 2019: 15 2020: 20 2021: 62 2022: 23 2023: 77 77 2024: 57 2025: 30 201120122013201420152016201720182019202020212022202320242025
Days each year on which a satellite-traced plume of medium or heavy smoke covered the county’s population centre, 2011 to 2025.
  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.

Floods and flood insurance

11 federal flood insurance claims since 1997, with $98,000 paid.

Federal flood insurance claims by year 2011: 5 5 2011
Claims per year since 1997. Years with fewer than five claims are not shown.

Most claims in one year

2011: 5 claims

$40,000 paid.

Flood events since 1996

  • Flash Flood4
  • Flood3
  • Heavy Rain2

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

Most severe crest

April 28, 2009

James River near Kensal, 16.69 ft

7.69 feet above the 9.0 ft flood stage; major flooding by today’s categories.

Most recent moderate or major crest

April 12, 2011

James River near Kensal, 14.41 ft

Major flooding.

Highest river crests above flood stage
Apr 28, 2009James River near Kensal16.69+7.69Major
Apr 17, 2009James River near Grace City17.74+5.74Major
Apr 18, 2009James River near Kensal14.70+5.70Major
Apr 11, 2011James River near Grace City17.54+5.54Major
Apr 12, 2011James River near Kensal14.41+5.41Major
Jan 1, 1979James River near Kensal14.35+5.35Major
Apr 7, 1997James River near Kensal14.00+5.00Major
Mar 21, 1996James River near Grace City16.18+4.18Major
Apr 3, 1997James River near Grace City14.77+2.77Moderate
Mar 28, 1987James River near Kensal11.48+2.48Moderate
Apr 15, 1996James River near Grace City13.94+1.94Minor
Mar 28, 2001James River near Grace City13.65+1.65Minor
Jul 29, 1993James River near Kensal10.64+1.64Minor
Jul 28, 1993James River near Grace City13.49+1.49Minor
Oct 26, 2019James River near Kensal10.37+1.37Minor
Mar 30, 1999James River near Kensal10.30+1.30Minor
Mar 30, 2004James River near Kensal10.28+1.28Minor
Apr 4, 2010James River near Kensal10.23+1.23Minor
Mar 27, 2001James River near Kensal10.14+1.14Minor
Mar 19, 1995James River near Grace City13.13+1.13Minor
May 4, 2013James River near Kensal10.10+1.10Minor
Mar 28, 1999James River near Grace City13.07+1.07Minor
Mar 25, 1994James River near Kensal9.49+0.49Minor
Mar 21, 1995James River near Kensal9.24+0.24Minor
Mar 28, 1987James River near Grace City12.20+0.20Minor

River gauges

River gauges and their highest listed crests
James River near Grace City12.017.74 ftApr 17, 20093
James River near Kensal9.016.69 ftApr 28, 20095
  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.

Drought

In severe drought or worse for 96 of 1,581 months since 1895 (6%); the longest spell lasted 20 months.

96

Months in severe drought or worse since 1895

42

Months in extreme drought

6%

Share of all months, severe or worse

9

Drought reports to the Weather Service since 1996

Lowest reading

July 2021

−6.35, extreme drought

Longest severe spell

20 months

August 1938 to March 1940.

Latest month

September 2026

−0.80, incipient dry spell

Last severe month: September 2021.

Months in severe drought or worse, by year 1895: 0 1896: 0 1897: 0 1898: 0 1899: 0 1900: 3 1901: 0 1902: 0 1903: 0 1904: 0 1905: 0 1906: 0 1907: 0 1908: 0 1909: 0 1910: 5 1911: 0 1912: 0 1913: 0 1914: 0 1915: 0 1916: 0 1917: 0 1918: 0 1919: 0 1920: 0 1921: 0 1922: 0 1923: 0 1924: 0 1925: 0 1926: 0 1927: 0 1928: 0 1929: 0 1930: 0 1931: 0 1932: 0 1933: 2 1934: 5 1935: 0 1936: 7 1937: 10 1938: 7 1939: 12 12 1940: 4 1941: 0 1942: 0 1943: 0 1944: 0 1945: 0 1946: 0 1947: 0 1948: 0 1949: 0 1950: 0 1951: 0 1952: 0 1953: 1 1954: 0 1955: 0 1956: 0 1957: 0 1958: 0 1959: 2 1960: 0 1961: 0 1962: 0 1963: 1 1964: 2 1965: 0 1966: 0 1967: 0 1968: 0 1969: 0 1970: 0 1971: 0 1972: 0 1973: 2 1974: 0 1975: 0 1976: 5 1977: 6 1978: 0 1979: 0 1980: 0 1981: 0 1982: 0 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 7 1989: 5 1990: 2 1991: 1 1992: 1 1993: 0 1994: 0 1995: 0 1996: 0 1997: 0 1998: 0 1999: 0 2000: 0 2001: 0 2002: 0 2003: 0 2004: 0 2005: 0 2006: 0 2007: 0 2008: 0 2009: 0 2010: 0 2011: 0 2012: 0 2013: 0 2014: 0 2015: 0 2016: 0 2017: 0 2018: 0 2019: 0 2020: 0 2021: 6 2022: 0 2023: 0 2024: 0 2025: 0 18951905191519251935194519551965197519851995200520152025
Months each year with a Palmer index of −3 or lower, 1895 to 2025. Twelve means the whole year.
  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.

Earthquakes and landslides

1 earthquake of magnitude 2.5 or more within 50 miles since 2008; none reached magnitude 4.

0

Magnitude 2.5+ inside the county since 1973

0

Magnitude 3+ within 50 miles since 1973

0

Magnitude 4+ within 50 miles since 1900

0

Magnitude 5+ within 50 miles since 1900

Largest within 50 miles

November 15, 2008

Magnitude 2.6

6 km ESE of Goodrich, North Dakota; 37.2 miles away, 11.2 miles deep.

  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

7

Landslides mapped, probable or better

0

With a recorded date

1

Source inventory

Mapped by ND GS (7).

  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.

Severe weather and other events

405 events in the National Weather Service record, 361 of them since 1996.

68

Hail reports, 1 inch or larger

7

Hail, 2 inches or larger

63

Damaging gusts, 58 mph+

115

Winter weather events since 1996

2

Heat events since 1996

37

Cold events since 1996

Largest hail

August 18, 1994

2.75 inches

Strongest measured or estimated gust

July 21, 2014

105 mph

More event types since 1996

Other Storm Events types since 1996
Dense fog and smoke100May 17, 2023

Costliest events since 1996

  1. Jun 25, 1999Thunderstorm Wind$10.0 million
    National Weather Service narrative

    Damage to 400 farm dwellings and 250 farm structures, including grain bins and farm machinery.

  2. Jul 21, 2014Thunderstorm Wind$2.0 million
    National Weather Service narrative

    Severe thunderstorm winds of 65 to 105 miles per hour tore across Foster County causing extensive damage on many farms and in towns. Damage included grain bins destroyed, a grain elevator severely damaged, roofs torn off of outbuildings, and damage to homes. Vehicle damage was also surveyed, including to a semi tractor that was struck by a grain bin. Agricultural damage was severe and extensive.

  3. Jan 9, 1997Blizzard, Foster$1.5 million
    National Weather Service narrative

    The second blizzard in less than 1 week brought North Dakota to a virtual standstill. This blizzard didn't bring as much snow as the first storm, but the winds gusted from the northwest as high at 40 mph and they lasted for 3 days. Snowfall amounts from this storm varied from 1-2 inches in the southwest to 2-4 inches in the central. But the strong winds combined with this snow as well as the snow from the blizzard a few days earlier created widespread whiteout conditions that lasted for 3 days. There were numerous communities that halted mail delivery and cancelled school. In Emmons Co. every road was blocked by drifts, some as high as 18 feet. In McLean Co. there was a drift at…

  4. Aug 6, 2011Flash Flood$1.0 million
    National Weather Service narrative

    Very heavy rain washed out a culvert under the Canadian Pacific railroad tracks near Kensal at a bridge crossing the James River. The washout caused two locomotives and approximately 25 cars to derail.

  5. Apr 4, 1997Blizzard, Foster$1.0 million
    National Weather Service narrative

    Warm weather the first three days of April lead much of North Dakota to believe that spring had arrived with temperatures in the 60s and 70s. Mother Nature had other plans. A very strong area of low pressure moved out of the Colorado area into the northern plains. Warm moist air ahead of the low collided with cold air coming down from Canada. The result was the worst blizzard of the season for North Dakota, bringing much of the state to a complete halt. The precipitation began to fall during the afternoon of the 4th (Friday), as rain in the east and freezing rain or sleet in the west. By Friday evening the freezing rain and sleet had changed over to all snow in the west. By…

  6. Jan 15, 1997Blizzard, Foster$900,000
    National Weather Service narrative

    The 3rd blizzard to hit North Dakota in less than 3 weeks affected mainly the east-central and eastern part of the state. Again, like the previous blizzard, the winds was the major weather factor. Wind gusts at times were over 50 mph. This created widespread blowing and drifting snow. All major roads in the area were closed again for the 3rd time this year. In Logan Co. the machine shed that is used by the Logan Co. Historical Society to store antiques was damaged by the roof falling in. With the severity of the blowing and drifting snow, roads that were just opened from the last storm were once again blown shut. This lead to the death of a 71 yr. old Fredonia(Logan Co.) man. He…

  7. Jan 21, 1997Blizzard, Foster$790,000
    National Weather Service narrative

    The last in a string of 4 blizzards to hit North Dakota struck in the morning of the 22nd. Snow amounts with this storm ranged from 2-4 inches, but northwest winds gusted to near 45 mph. Again, east-central and eastern North Dakota were hardest hit. I-29 in North Dakota and I-94 from Bismarck to Fargo were closed again. Injuries and damage amounts estimated.

  8. Apr 1, 2009Flood$555,000
    National Weather Service narrative

    Rapid snowmelt caused heavy overland flooding and flooding along the James River. This resulted in flood damage to numerous county and local roads, railroad bridges, and seven homes.

  9. Jul 21, 2014Thunderstorm Wind$500,000
    National Weather Service narrative

    Structural, tree, and crop damage occurred in and around Grace City.

  10. Dec 26, 2023Ice Storm, Foster$500,000
    National Weather Service narrative

    Multiple utility poles were broken, along with multiple cross-members. Many miles of power lines throughout the county were down. At one point, 48% of utility customers were without power. Travel became nearly impossible given the icy conditions.

  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.

Weather records

From Carrington 4 N, 5.3 miles from the county’s population centre, with records from 1967.

All-time high
107°F2 times, most recently Aug 7, 1983
All-time low
−39°FFeb 1, 1996
Warmest night
76°FJul 20, 2011
Coldest day
−24°FJan 14, 1972
Wettest day
4.08 inSep 21, 2019
Snowiest day
27.0 inOct 14, 2019
Hottest year
1987mean 45.5°F
Coldest year
2019mean 36.7°F
Wettest year
199329.71 in
Driest year
197611.61 in
Snowiest season
118.3 in2022-23
Average monthly high and low temperature and precipitation, last 30 years, Carrington 4 N 32°F 19° 0° 0.5 Jan 23° 3° 0.4 Feb 36° 15° 0.6 Mar 52° 28° 1.1 Apr 67° 41° 2.5 May 77° 53° 3.0 Jun 82° 58° 2.7 Jul 80° 54° 2.4 Aug 72° 46° 1.7 Sep 56° 33° 1.4 Oct 38° 18° 0.5 Nov 23° 5° 0.7 Dec Precipitation, inches
Average daily high and low by month, and average monthly precipitation, over the last 30 years.
Nights at or below freezing per year 1976: 191 1982: 176 1984: 182 1985: 176 1986: 170 1987: 173 1988: 187 1989: 189 1990: 191 1991: 190 1992: 189 1993: 192 1994: 170 1995: 182 1999: 164 2004: 174 2009: 175 2010: 160 2011: 164 2012: 165 2016: 167 2017: 185 2018: 203 2019: 204 2020: 207 207 2021: 201 2022: 198 2023: 192 2024: 176 2025: 181 197619922016
Nights at or below freezing each complete year, last 50 years. Thirty-year average: 182.2.
Snowfall by winter 1976: 29.8 in 1978: 83.0 in 1979: 22.5 in 1982: 14.2 in 1987: 21.5 in 1989: 2.5 in 1992: 41.1 in 1996: 62.0 in 1997: 20.4 in 1998: 55.0 in 1999: 29.0 in 2000: 23.6 in 2007: 21.0 in 2008: 66.0 in 2009: 43.5 in 2020: 25.8 in 2021: 71.2 in 2022: 118.3 in 118.3 2023: 38.0 in 2024: 52.7 in 2025: 48.5 in 197619992025
Total snowfall each winter (July to June), last 50 winters.

Median first snow

November 13

Earliest: October 15, 2009

Median last snow

April 4

Latest: May 18, 1968

0 of 24 winters had no measurable snow.

Station Carrington 4 N (USC00321362), 1,560 ft elevation, 5.3 miles from the population centre. Daily records from 1967 to October 16, 2026; 88.0% 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.

Federal disaster declarations

23 since 1953. The most recent: Severe Storm, Tornadoes, and Straight-Line Winds, September 11, 2025.

Federal disaster declarations
Sep 11, 2025Severe StormSevere Storm, Tornadoes, and Straight-Line WindsMajor disasterDR-4888-ND
Jul 13, 2022Severe StormSevere Winter Storm and FloodingMajor disasterDR-4660-ND
Jul 9, 2020FloodFloodingMajor disasterDR-4553-ND
Apr 1, 2020BiologicalCovid-19 PandemicMajor disasterDR-4509-ND
Mar 13, 2020BiologicalCovid-19EmergencyEM-3477-ND
Jan 21, 2020FloodFloodingMajor disasterDR-4475-ND
May 29, 2013FloodFloodingMajor disasterDR-4118-ND
May 10, 2011FloodFloodingMajor disasterDR-1981-ND
Apr 30, 2010FloodFloodingMajor disasterDR-1907-ND
Mar 14, 2010FloodFloodingEmergencyEM-3309-ND
Mar 24, 2009Severe StormSevere Storms and FloodingMajor disasterDR-1829-ND
Sep 13, 2005Coastal StormHurricane Katrina EvacuationEmergencyEM-3247-ND
May 28, 2001FloodSevere Storms, Flooding, & Ground SaturationMajor disasterDR-1376-ND
Jun 27, 2000Severe StormSevere Storms, Flooding and Ground SaturationMajor disasterDR-1334-ND
Jun 8, 1999FloodSevere Storms, Flooding, Snow, Ice, Ground Saturation, Lanslides, Mudslides, and TorMajor disasterDR-1279-ND
Apr 7, 1997FloodSevere Flooding,Severe Winter Storms, Snowmelt, Spring RainsMajor disasterDR-1174-ND
Jan 12, 1997Severe StormSevere Winter Storms and Blizzard ConditionsMajor disasterDR-1157-ND
Jun 5, 1996Severe StormSevere Storms,Flooding, & Ice JamsMajor disasterDR-1118-ND
May 16, 1995Severe StormSevere Storms, Flooding, and Ground SaturationMajor disasterDR-1050-ND
Jul 1, 1994Severe StormSevere Storms, FloodingMajor disasterDR-1032-ND
Apr 26, 1979FloodSevere Storms, Snowmelt & FloodingMajor disasterDR-581-ND
May 14, 1974FloodHeavy Rains, Snowmelt & FloodingMajor disasterDR-434-ND
Apr 18, 1969FloodFloodingMajor disasterDR-256-ND

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.

How this compares

Where Foster County stands among 53 counties in North Dakota and 3,143 in the United States.

Ranks
Tornadoes since 19501743 / 531,740 / 3,143
Tornadoes rated F3/EF3 or stronger0——
Tropical cyclones within 50 mi0——
Hurricane-strength passes within 50 mi0——
Wildfire acres since 19840——
Flood insurance claims1129 / 532,296 / 3,143
Flood insurance paid$98,00030 / 532,372 / 3,143
Disaster declarations2335 / 531,054 / 3,143
Flood events since 1996942 / 532,928 / 3,143
Hail and wind events since 199617349 / 532,186 / 3,143
Winter storm events since 199611522 / 53777 / 3,143
Reported damage since 1996$20.8 million23 / 531,459 / 3,143
River crests at major flood stage812 / 53612 / 3,143
High tide flooding days a year, last 10 years0.0——
Months in severe drought since 18959649 / 532,479 / 3,143
Medium or heavy smoke days a year, last 10 years35.521 / 5329 / 3,143
Earthquakes M4+ within 50 mi since 19000——
Earthquakes M2.5+ in the county since 19730——

Neighbouring counties

Neighbouring counties
Eddy County2002123
Griggs County39005
Stutsman County5807,559127
Wells County27002

Sources and vintage

Every number on this page comes from these public records.

  • 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 USC00321362.
  • 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.