Wyoming
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Teton
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Kelly, Wilson, Hoback
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May 18, 1927
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Dam Failure, Flood
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6
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$27,000,000.00
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"1927’s Kelly Flood resulted from a dam failure. The following summary is taken from the Teton County website: 'On June 23, 1925, part of the northern face of Sheep Mountain became unstable after weeks of heavy rain and slid into the Gros Ventre River. The 50 million cubic yards of sedimentary rock formed a natural dam 200 feet high and 400 yards wide that created Lower Slide Lake. On May 18th, 1927, a portion of the natural dam broke causing a flash flood to rush down the Gros Ventre River. The flood was at least 6 feet deep for at least 25 miles downstream and wiped out the town of Kelly six miles downstream. Six people died, and many others lost everything they owned. Fifteen miles downstream in Wilson, Wyoming six feet of water inundated the town and hundreds of farm animals died. In narrower sections of the Snake River near Hoback, flood waters rose as much as 50 feet. The next day the waters reached Idaho Falls, Idaho and covered lowland sections there. When all was said and done, damages totaled $500,000, which would be more than $27 million in today's dollars. You can still see the bald rock on the north face of Sheep Mountain (Sleeping Indian) as a reminder of this tragic event.'" - WY Hazard Mitigation Plan 2021-2026
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Wyoming
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Lincoln
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La Barge
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September 01, 1964
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Dam Failure
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"In September 1964, seepage at the newly-built Fontenelle Dam on the Green River near La Barge, Wyoming led to a partial collapse of a 15’ by 20’ section of the dam crest. The downstream town of Green River was on edge for a week and the story made national headlines, but no damage was reported." - WY Hazard Mitigation Plan 2021-2026
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Colorado, Utah
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January 01, 2018
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Drought
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"Gov. Herbert declares drought emergency for all of Utah." An extreme to exceptional drought centered on the 4-corners region began in mid-February 2018 and lasted almost an entire year, with relief from the exceptional drought designation lifting finally in January 2019. Almost the entire states of Utah and Arizona, northern New Mexico, and the southwestern portion of Colorado were under severe, extreme, or exceptional drought designation for much of the year. For the 2018 water year, the USGS stream gage on the San Juan River near Bluff, Utah, (09379500) broke its 92-year record for lowest total discharge, 481.8 kaf (the average has been 2.94 maf). It was the driest water year on record (beginning 1895) for the state of Utah, with 8.07" of precipitation, and in Colorado, it was the driest since 2002 with 12.8" of precipitation. According to the Salt Lake Tribune,16 of Utah’s major reservoirs were less than 20 percent full at the end of water year 2018, prompting the governor to declare a drought emergency for the state that was not rescinded until October 2019." - Salt Lake Tribune
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Colorado, Utah
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May 19, 2020
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Drought
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In May 2020, extreme drought started in south CO. Over the course of the summer, the south and entire west of the state are affected by extreme drought. In July 2020, pockets of extreme drought start to develop in central UT as well as in central WY. In September, almost all of UT is affected by extreme drought, with pockets of exceptional drought forming. Pockets of exceptional drought form in west CO. In October 2020, pockets of extreme drought also start forming in east CO. Large areas of UT are affected by exceptional drought in October, and in December, almost the entire state is experiencing exceptional drought. In May 2021, the extreme drought areas in WY have disappeared. In November 2021, drought in CO is mostly resolved to non-extreme levels. In December 2021, UT is still experiencing extreme drought in most of the state.
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Colorado
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Denver, Adams, Arapahoe, Boulder, Broomfield, Jefferson, Weld
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October 12, 2021
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Drought
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In October, a pocket of extreme drought develops in northeast CO. This pocket expands and covers several counties in December.
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Colorado, Utah, Wyoming
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May 22, 2012
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Drought
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In May 2012, a pocket of extreme drought develops in northwest CO. This pocket expands over most of CO and eastern UT through the summer of that year. In July, exceptional drought conditions develop in southeast CO (and this exceptional and extreme drought in this region only resolves in August of 2014). In July 2012, pockets of extreme drought start to develop in WY, with exceptional drought developing in the eastern part of the state in September 2012. In January 2013, extreme drought ends in UT. In October 2013, the last portions of extreme drought in WY disappear.
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Colorado
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June 01, 2012
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Drought
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Heat Wave/Drought. "Many record high temperatures were also set during the summer months, especially June, where June of 2012 was the hottest June in Denver since weather records began back in 1872. Many areas in western Colorado also saw record high temperatures including several 100 degree days. This record breaking and triple digit heat was felt statewide. Denver had a total of seventeen 90 degree days and a stretch of five consecutive 100 degree days during the month of June, compared to eighteen 90 degree days and six 100 degree days in Grand Junction during the same month. To put it in perspective, the normal high temperature in Denver during the month of June is 82 degrees on average, making high temperatures in June 2012 some 10 to 20 degrees above normal. On the other side of the divide, the normal high temperature in Grand Junction during the month of June is 88 degrees on average, making high temperatures in June 2012 some 8 to 12 degrees above normal which is still very hot for this time of year." - NWS
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Colorado
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Larimer
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Rustic
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July 20, 2021
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Flood, Landslide
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3
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In Poudre Canyon, "flooding occurred around the burn scar of the Cameron Peak Fire, the largest recorded fire in [Colorado] history. More than 30 miles of Colorado 14, between Rustic and the intersection with Colorado 287, closed and was evacuated Tuesday after an inch of rain caused debris from the burn scar to flow downstream and flood the river." - CPR News
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Utah
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Emery
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August 02, 2021
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Flood
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1
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"Flash flooding at an Emery County mine resulted in the death of at least one person when water and debris swept him six miles downstream." - KSL News Radio
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Utah
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Emery
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Green River
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May 11, 2020
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Flood
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2
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"A tragic end followed a Mother’s Day weekend camping trip as the bodies of two young sisters were recovered after being swept away in a flash flood in a narrow slot canyon near Goblin Valley State Park." - Deseret News
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