Rio Grande County

Population 11,087 (2025) 912 sq mi

Large wildfires have burned 9,397 acres of Rio Grande County since 1984, 41st most of 64 counties in Colorado; the largest was the Million Fire in 2002.

Hazard fingerprint for Rio Grande County Tornado: 8th percentile. Tropical: 0th percentile. Wildfire: 44th percentile. Flood: 5th percentile. Hail & wind: 12th percentile. Heat: 0th percentile. Cold: 16th percentile. Winter: 99th 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 19503
  • Wildfire burn scars since 19842

At a glance

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

Acres burned since 1984

9,397

41st of 64 in Colorado

2 large fires; the largest was Million, 2002

Details

Tornadoes since 1950

3

40th of 64 in Colorado

Fewer than the typical Colorado county, which has had 9

Details

Flood insurance claims

11

30th of 64 in Colorado

$14,000 paid since 1980

Details

Strongest tornado

EF0

September 25, 2012, 1.4 mile path

Largest earthquake within 50 mi

5.1magnitude

January 22, 1966, 32.9 miles away

Details

Federal disaster declarations

9

Most recent: Covid-19 Pandemic, 2020

Details

Record high

96°F

July 30, 2016

Details

Record low

−38°F

January 13, 1963

Details

Tornadoes

About one every 25 years since 1950, none rated F3/EF3 or stronger.

Strongest

September 25, 2012

EF0, 1.4 mile path

100 yards wide.

Most recent

Tuesday, September 25, 2012

EF0, 1.4 mile path

14 years ago.

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

Every recorded tornado

Tornadoes in Rio Grande County since 1950
Sep 25, 2012EF01.410000
Jun 29, 1995F00.11000
Jun 27, 1995F00.11000
  1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Rio Grande 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

9,397 acres burned in 2 large fires since 1984, equal to 1.6% of the land.

Largest

June 19, 2002

Million Fire, 7,919 acres

7,921 acres inside Rio Grande County.

Most recent

June 19, 2002

Million Fire

7,919 acres in total.

Acres burned since 1984, cumulative 1989: 1,4762002: 7,921 9,397 acres 198519901995200020052010201520202025
Running total of acres burned inside the county (line) and each year’s acres (bars).

Every large fire

Large wildfires since 1984
Million20027,9217,919
Mv Brown19891,4751,468
  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

Smokiest year

2021: 28 days

Heavy smoke on 10 days in 2020, the most of any year.

Last 10 years

8.8 days a year

Medium or heavy smoke, 2016 to 2025.

2025

12 days

Medium or heavy smoke. 16 so far in 2026.

Days with medium or heavy smoke overhead, by year 2011: 9 2012: 13 2013: 9 2014: 0 2015: 1 2016: 1 2017: 4 2018: 8 2019: 2 2020: 18 2021: 28 28 2022: 5 2023: 8 2024: 2 2025: 12 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 1980, with $14,000 paid.

Federal flood insurance claims by year
Claims per year since 1980. Years with fewer than five claims are not shown.

Claims by ZIP code

Flood insurance claims by ZIP code
811446$13,000

Flood events since 1996

  • Heavy Rain4
  • Flash Flood2

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

October 15, 1911

South Fork Rio Grande at South Fork, 9.70 ft

2.70 feet above the 7.0 ft flood stage; major flooding by today’s categories.

Most recent moderate or major crest

October 14, 2025

South Fork Rio Grande at South Fork, 7.63 ft

Moderate flooding.

Highest river crests above flood stage
Oct 15, 1911South Fork Rio Grande at South Fork9.70+2.70Major
Oct 5, 1911Rio Grande near Del Norte6.80+1.30Moderate
Oct 14, 2025South Fork Rio Grande at South Fork7.63+0.63Moderate
Jun 29, 1927Rio Grande near Del Norte6.40+0.90Minor
Jun 19, 1949Rio Grande near Del Norte6.16+0.66Minor
Jun 13, 1921Rio Grande near Del Norte6.10+0.60Minor
Jun 9, 1985Rio Grande near Del Norte5.91+0.41Minor
May 22, 1948Rio Grande near Del Norte5.81+0.31Minor
Jun 15, 1917Rio Grande near Del Norte5.80+0.30Minor
Jun 12, 2019Rio Grande near Del Norte5.69+0.19Minor
May 30, 1979Rio Grande near Del Norte5.68+0.18Minor
Jun 10, 1980Rio Grande near Del Norte5.59+0.09Minor
Jun 19, 1941Rio Grande near Del Norte5.56+0.06Minor
Jun 18, 1995Rio Grande near Del Norte5.500.00Minor
May 27, 1984Rio Grande near Del Norte5.43−0.07Action
May 24, 1984South Fork Rio Grande at South Fork6.91−0.09Action
May 22, 2005Rio Grande near Del Norte5.40−0.10Action
Jun 7, 1986Rio Grande near Del Norte5.39−0.11Action
Sep 6, 1970Rio Grande near Del Norte5.36−0.14Action
Jun 17, 1995South Fork Rio Grande at South Fork6.86−0.14Action
Jun 2, 1997Rio Grande near Del Norte5.33−0.17Action
Jun 18, 1949South Fork Rio Grande at South Fork6.83−0.17Action
May 24, 2005South Fork Rio Grande at South Fork6.83−0.17Action
May 30, 1922Rio Grande near Del Norte5.30−0.20Action
Jun 16, 1987Rio Grande near Del Norte5.22−0.28Action

River gauges

River gauges and their highest listed crests
Rio Grande at Monte Vista9.08.00 ftJun 19, 19490
Rio Grande near Del Norte5.56.80 ftOct 5, 19110
South Fork Rio Grande at South Fork7.09.70 ftOct 15, 19111
  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 261 of 1,581 months since 1895 (17%); the longest spell lasted 20 months.

261

Months in severe drought or worse since 1895

106

Months in extreme drought

17%

Share of all months, severe or worse

Lowest reading

August 2002

−7.41, extreme drought

Longest severe spell

20 months

March 2002 to October 2003.

Latest month

September 2026

−4.59, extreme drought

Months in severe drought or worse, by year 1895: 0 1896: 0 1897: 0 1898: 0 1899: 0 1900: 0 1901: 10 1902: 10 1903: 0 1904: 6 1905: 0 1906: 0 1907: 0 1908: 0 1909: 0 1910: 0 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: 2 1927: 3 1928: 8 1929: 3 1930: 0 1931: 1 1932: 0 1933: 0 1934: 7 1935: 2 1936: 3 1937: 0 1938: 0 1939: 3 1940: 10 1941: 0 1942: 0 1943: 1 1944: 0 1945: 0 1946: 8 1947: 6 1948: 0 1949: 0 1950: 9 1951: 10 1952: 0 1953: 0 1954: 1 1955: 11 11 1956: 10 1957: 0 1958: 0 1959: 0 1960: 0 1961: 0 1962: 0 1963: 5 1964: 9 1965: 0 1966: 0 1967: 0 1968: 0 1969: 0 1970: 0 1971: 0 1972: 5 1973: 0 1974: 5 1975: 0 1976: 0 1977: 7 1978: 7 1979: 0 1980: 0 1981: 5 1982: 0 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 0 1989: 0 1990: 0 1991: 0 1992: 0 1993: 0 1994: 0 1995: 0 1996: 0 1997: 0 1998: 0 1999: 0 2000: 0 2001: 0 2002: 10 2003: 10 2004: 0 2005: 0 2006: 1 2007: 0 2008: 0 2009: 0 2010: 0 2011: 3 2012: 11 2013: 8 2014: 1 2015: 2 2016: 0 2017: 0 2018: 10 2019: 0 2020: 8 2021: 11 2022: 6 2023: 3 2024: 3 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 4 or more within 50 miles since 1900; the largest was magnitude 5.1 in 1966.

3

Magnitude 2.5+ inside the county since 1973

8

Magnitude 3+ within 50 miles since 1973

1

Magnitude 4+ within 50 miles since 1900

1

Magnitude 5+ within 50 miles since 1900

Largest within 50 miles

January 22, 1966

Magnitude 5.1

4 km NNW of Lumberton, New Mexico; 32.9 miles away, 6.2 miles deep.

Most recent, magnitude 3 or more

July 5, 2026

Magnitude 3.5

17 km WSW of Los Ojos, New Mexico; 49.3 miles away.

Earthquakes of magnitude 3 or more within 50 miles, by year 1973: 0 1974: 0 1975: 0 1976: 0 1977: 0 1978: 0 1979: 0 1980: 0 1981: 0 1982: 0 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 1 1989: 0 1990: 0 1991: 1 1992: 0 1993: 0 1994: 0 1995: 0 1996: 0 1997: 0 1998: 0 1999: 0 2000: 0 2001: 0 2002: 0 2003: 2 2 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: 1 2018: 0 2019: 2 2020: 0 2021: 0 2022: 0 2023: 0 2024: 0 2025: 0 19731978198319881993199820032008201320182023
Per year, 1973 to 2025.

Every earthquake of magnitude 4 or more within 50 miles

Earthquakes of magnitude 4 or more within 50 miles
Jan 22, 19665.132.96.24 km NNW of Lumberton, New Mexico
  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

14

Landslides mapped, probable or better

0

With a recorded date

1

Source inventory

Mapped by CO GS (14).

  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

746 events in the National Weather Service record, 733 of them since 1996.

13

Hail reports, 1 inch or larger

0

Hail, 2 inches or larger

0

Damaging gusts, 58 mph+

598

Winter weather events since 1996

0

Heat events since 1996

3

Cold events since 1996

Largest hail

July 12, 1955

1.75 inches

Strongest measured or estimated gust

August 6, 1973

0 mph

More event types since 1996

Other Storm Events types since 1996
Dust storms and dust devils100Mar 15, 2026
Dense fog and smoke100May 1, 2026
Debris flows100Aug 8, 2006
Avalanches451Feb 2, 2016

Costliest events since 1996

  1. Jul 1, 2002Wildfire$11.0 million
    National Weather Service narrative

    Continued from the previous month. The Million Fire was contained on Independence Day, after consuming 9300 acres.

  2. Jun 19, 2002Wildfire$11.0 million
    National Weather Service narrative

    The Million Fire started in a rolled up section of illegally dumped sod. It is not known for sure whether the sod spontaneously combusted or was set on fire by a human. The fire spread rapidly with dry conditions and high winds. The 9300 acre fire totally destroyed 11 high end residences. Six residences were heavily damaged, and 2 outbuildings were destroyed. The fire was contained on July 4th. It cost nearly 3 1/2 million dollars to fight the fire.

  3. Dec 5, 1996High Wind, Alamosa Vicinity / Central San Luis Valley Below 8500 Ft$50,000
    National Weather Service narrative

    Strong winds occurred from the Sangre de Cristo mountains and east from early morning of the 4th through most of the day, as a powerful jet stream moved across Colorado. Sustained winds of 30 to 50 mph prevailed across the entire area before tapering off by late afternoon of the 5th. Damaging wind gusts began early morning of the 5th. Winds gusts to between 70 and 100 mph in the mountains west of and into Colorado Springs. In El Paso County a 70 foot Ponderosa pine fell on a house, and numerous fences and other outbuildings were damaged. Extensive damage occurred across the Wet Mountain Valley. Numerous power lines, smaller buildings, house and vehicle windows, and large trees…

  4. Sep 25, 2012Tornado$5,000
    National Weather Service narrative

    A strong storm produced a non-mesocyclone (landspout) tornado just south of Del Norte. There was minor damage to several properties...including one property which sustained damage to a camper and minor structural damage to the house.

  5. May 24, 2010High Wind, Del Norte Vicinity / Northern San Luis Valley Below 8500 Ft$4,000
    National Weather Service narrative

    Gradient winds...gusting up to 75 mph caused damage...especially over portions of El Paso and Pueblo Counties. Several large trees were uprooted in the Monte Vista area in Rio Grande County. A modular building was flipped on its top by the wind in Pueblo West. A few trees were also uprooted in the City of Pueblo. Winds caused power lines to come down in Manitou Springs, which sparked several small grass fires near the Pikes Peak Cog Railway. Three hangers at Peterson Air Force Base were evacuated, and some minor roof damage occurred. Some trees were uprooted in the greater Colorado Springs area. On Fort Carson, eight soldiers were injured when a tent they were setting up blew…

  6. Jun 6, 2007Wildfire, Alamosa Vicinity / Central San Luis Valley Below 8500 Ft$1,000
    National Weather Service narrative

    High winds across the San Luis Valley knocked over an electrical transmission line on Lane 6, 10 miles southwest of the Great Sand Dunes. The fire eventually consumed 320 acres of grass and brush as it spread to the northeast. No structures were involved, but the Great Sand Dunes was evacuated until 5 p.m.

  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 Monte Vista 2W, 3.7 miles from the county’s population centre, with records from 1893.

All-time high
96°FJul 30, 2016
All-time low
−38°FJan 13, 1963
Warmest night
59°FJul 16, 1944
Coldest day
−3°FDec 24, 1990
Wettest day
2.20 inApr 3, 1986
Snowiest day
17.0 inMar 15, 1942
Hottest year
2003mean 44.0°F
Coldest year
2013mean 37.6°F
Wettest year
202416.52 in
Driest year
19503.51 in
Snowiest season
49.6 in1967-68
Average monthly high and low temperature and precipitation, last 30 years, Monte Vista 2W 32°F 34° -1° 0.4 Jan 40° 6° 0.3 Feb 52° 16° 0.6 Mar 59° 23° 0.6 Apr 68° 32° 0.7 May 78° 40° 0.5 Jun 81° 47° 1.4 Jul 79° 45° 1.4 Aug 74° 37° 1.1 Sep 62° 25° 1.0 Oct 49° 13° 0.4 Nov 36° 2° 0.4 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 1980: 228 1982: 229 1983: 231 1984: 219 1985: 227 1986: 234 1991: 205 1993: 207 1994: 212 1995: 230 1996: 190 1997: 204 1998: 218 2000: 210 2001: 203 2002: 212 2003: 212 2004: 225 2005: 215 2007: 226 2008: 258 258 2009: 233 2010: 234 2011: 235 2012: 238 2013: 214 2014: 233 2015: 221 2016: 248 2017: 234 2018: 231 2019: 238 2020: 236 2021: 225 2022: 219 2023: 225 2024: 230 2025: 229 1980199620082018
Nights at or below freezing each complete year, last 50 years. Thirty-year average: 224.9.
Snowfall by winter 1976: 6.5 in 1981: 9.0 in 1982: 12.1 in 1983: 29.2 in 1984: 25.3 in 1985: 27.4 in 1986: 42.1 in 1988: 17.6 in 1990: 30.5 in 1992: 37.0 in 1993: 39.0 in 1994: 32.6 in 1995: 11.9 in 1996: 33.2 in 1997: 32.6 in 1998: 19.7 in 2000: 43.6 in 2001: 18.3 in 2002: 17.1 in 2003: 48.8 in 2004: 38.7 in 2005: 13.1 in 2006: 38.5 in 2007: 47.9 in 2008: 35.2 in 2009: 41.4 in 2013: 36.4 in 2014: 24.6 in 2015: 49.1 in 49.1 2016: 43.0 in 2017: 19.3 in 2018: 47.8 in 2019: 22.9 in 2020: 47.2 in 2021: 16.1 in 2022: 21.8 in 2023: 32.9 in 2024: 35.0 in 2025: 6.8 in 1976199320042017
Total snowfall each winter (July to June), last 50 winters.

Median first snow

November 8

Earliest: September 9, 2020

Median last snow

April 18

Latest: May 18, 1971

2 of 70 winters had no measurable snow.

Station Monte Vista 2W (USC00055706), 7,695 ft elevation, 3.7 miles from the population centre. Daily records from 1893 to October 27, 2026; 96.6% 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

9 since 1953. The most recent: Covid-19 Pandemic, March 28, 2020.

Federal disaster declarations
Mar 28, 2020BiologicalCovid-19 PandemicMajor disasterDR-4498-CO
Mar 13, 2020BiologicalCovid-19EmergencyEM-3436-CO
Jun 21, 2013FireWest Fork Fire ComplexFire managementFM-5031-CO
Sep 5, 2005Coastal StormHurricane Katrina EvacuationEmergencyEM-3224-CO
Jun 19, 2002FireMillion FireFire managementFM-2428-CO
Jun 19, 2002FireWildfiresMajor disasterDR-1421-CO
Jan 29, 1977DroughtDroughtEmergencyEM-3025-CO
Jul 6, 1973FloodFlooding & LandslidesMajor disasterDR-396-CO
Sep 22, 1970FloodHeavy Rains & FloodingMajor disasterDR-293-CO

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 Rio Grande County stands among 64 counties in Colorado and 3,143 in the United States.

Ranks
Tornadoes since 1950340 / 642,775 / 3,143
Tornadoes rated F3/EF3 or stronger0——
Tropical cyclones within 50 mi0——
Hurricane-strength passes within 50 mi0——
Wildfire acres since 19849,39741 / 64814 / 3,143
Flood insurance claims1130 / 642,296 / 3,143
Flood insurance paid$14,00036 / 642,669 / 3,143
Disaster declarations929 / 642,860 / 3,143
Flood events since 1996654 / 643,022 / 3,143
Hail and wind events since 199611139 / 642,687 / 3,143
Winter storm events since 199659814 / 6428 / 3,143
Reported damage since 1996$22.1 million14 / 641,398 / 3,143
River crests at major flood stage19 / 641,446 / 3,143
High tide flooding days a year, last 10 years0.0——
Months in severe drought since 18952615 / 6472 / 3,143
Medium or heavy smoke days a year, last 10 years8.859 / 642,823 / 3,143
Earthquakes M4+ within 50 mi since 1900141 / 641,397 / 3,143
Earthquakes M2.5+ in the county since 1973320 / 64583 / 3,143

Neighbouring counties

Neighbouring counties
Alamosa County1601,87918
Archuleta County1034,25710
Conejos County502,2625
Mineral County1077,4300
Saguache County708,1082

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 USC00055706.
  • 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.