Flood in Wyoming

Events

193

Deaths

1

Injuries

0

Damage

$47 million

• Flooding in Wyoming, June 12 to 15, 2022$25 million · 5 eventsOn the weekend of June 11th and 12th, a stationary front set up across northwestern Wyoming.
• Flood in Wyoming, February 21 to 22, 20171 death · $10,000 · 1 eventOn February 21st temperatures warmed into the 50s across much of the Wind River Basin, this, combined with rain led to rapid melting of snow and led to flooding of ditches along roads as well as sheet flooding across portions of Fremont County north of Riverton.
• Flood in Wyoming, June 4 to 13, 2010$12 million · 1 eventSeveral days and nights of warm temperatures allowed much of an unseasonably high late-season snowpack to melt. The resultant water caused flooding along the Little Wind River and Middle Fork of the Popo Agie River.
• Flash Flooding and Flooding in Wyoming, May 24 to 26, 2015$1.9 million · 9 eventsA slow-moving upper level low south of Wyoming sent waves of moisture northward over central and eastern Wyoming during the Memorial Day holiday weekend. Measured and estimated rainfall totals ranged from two to around five inches.
• Flooding in Wyoming, June 3 to 24, 2017$2.0 million · 5 eventsThe combination of a very wet and snowy winter and a rather cool and wet spring set the stage for a prolonged period of flooding along the Wind River.
• Flooding in Wyoming, March 7 to 11, 2014$1.1 million · 4 eventsIce built up on area rivers following very cold temperatures through February and early March.
• Flood in Wyoming, May 7 to 10, 2016$1.2 million · 1 eventAn extremely slow-moving area of low pressure brought significant rainfall to the Wind River Basin during a 48-hour period from Friday evening, May 6, through Sunday evening, May 8.
• Flooding in Wyoming, June 24 to 25, 2011$755,000 · 3 eventsThe first extended warm spell of the season produced an active period of snowmelt from an historic snowpack in the western Bighorn Mountains. As a result, waterways in and near the foothills of the Bighorn Mountains rose rapidly causing flooding in Big Horn and Washakie counties.
• Flood in Wyoming, June 24 to 30, 2011$665,000 · 1 eventThe first extended warm spell of the summer provided an active period of snowmelt in the Wind River Basin. A cool, wet spring and early summer had kept snowpack in the surrounding mountains unseasonably high.
• Flooding in Wyoming, June 28 to 30, 2011$570,000 · 4 eventsThe warmest temperatures of the summer season produced snowmelt runoff in the drainages of the western Bighorn Mountains. Creeks and streams in Big Horn and Washakie counties quickly rose in response to the increased runoff. The flooding subsided during the morning of July 1.
• Flood in Wyoming, July 1 to 11, 2011$600,000 · 1 eventWater levels continued to rise on the Wind River into early July in response to rapid late-season snowmelt and increased releases from a reservoir. The flood waters reached record levels at Kinnear and Riverton and came very close at Dubois and Crowheart.
• Flood in Wyoming, May 20 to 23, 2011$520,000 · 1 eventA Pacific low moved into the four corners region on the 17th and migrated northeast into the Dakotas through the 22nd, bringing a round of heavy precipitation aided by a tap of Gulf of Mexico moisture.
• Flood in Wyoming, July 22 to 27, 2011$352,000 · 1 eventExcessive snowmelt runoff filled Big Horn Lake from late June through mid-July. Gusty winds combined with the already high water in the lake to cause significant problems on area roads in late July.
• Flood in Wyoming, May 15 to 19, 2011$200,000 · 1 eventLow elevation snowpack in the mountains bordering the west side of Star Valley melted rapidly as temperatures climbed into the 60s. The result was flooding along the Salt River and its tributaries.
• Flood in Wyoming, June 25 to 26, 2011$167,000 · 1 eventThe warmest temperatures of the season led to increased snowmelt along the west side of the Salt River Range. The water flowed fast and high enough to cause flooding in Star Valley Ranch.
• Flood in Wyoming, June 24 to 29, 2011$160,000 · 1 eventThe high waters at the confluence of the Lamar River and Soda Butte Creek combined to undercut and damage a 200-foot-section of Yellowstone National Park's Northeast Entrance road.
• Flooding in Wyoming, February 9 to 11, 2017$120,000 · 4 eventsDuring the night of February 9th, strong Chinook winds developed over the eastern Slope of the Wind River Mountains. Temperatures climbed into the 50s as a result.
• Flooding in Wyoming, July 1 to 7, 2011$125,000 · 3 eventsRapid melt of a strong late season snowpack resulted in high water levels along many rivers and streams in Sublette County. Certain sections of the Green and New Fork rivers flooded lowlands and in some cases necessitated the sandbagging of homes.
• Flood in Wyoming, May 28 to 30, 2019$125,000 · 1 eventSeveral days of heavy rainfall over the Big Horn Mountains and adjacent foothills resulted in widespread flooding and major impacts along the foothills of Sheridan County.
• Flooding in Wyoming, February 10 to 23, 2017$100,000 · 2 eventsA rapid warm up following several weeks of below normal temperatures and above average snowfall led to flooding along the Big Horn River in Washakie and Big Horn Counties. The result was rapidly rising rivers due to ice jams from rivers breaking up as well as rapid snow melt.
• Flood in Wyoming, June 5 to 7, 2008$100,000 · 1 eventRainfall of one and a half to three inches caused minor flooding in northeastern Crook County.
• Flood in Wyoming, June 1 to 3, 2013$100,000 · 1 eventA large upper level low pressure system pushed across the Northern Plains, bringing heavy rain to the Bear Lodge Mountains. Embedded thunderstorms produced additional heavy rain, with four to five inches of rain falling over a 24 hour period.
• Flood in Wyoming, July 1 to 2, 2011$65,000 · 1 eventFlood waters along the Greybull River subsided on July 1 and 2 as snowmelt decreased and a ridge of high pressure prevented additional thunderstorm development. More information regarding the onset of this flood episode can be found in the June 2011 Storm Data publication.
• Flooding in Wyoming, May 5 to 7, 2007$58,000 · 3 eventsHeavy rain fell across northeastern Wyoming as a strong storm system crossed the region. Two to five inches of rain in 36 hours caused significant runoff and flooding in the Gillette area. The Little Powder River and Donkey Creek rose above bankfull.
• Winter Storm and Flooding in Wyoming, May 21 to 24, 2008$50,000 · 6 eventsA strong upper level low stalled west of Wyoming. The resultant upslope flow east of the Continental Divide generated copious rainfall amounts across the lower elevations with accumulating snowfall in the mountains.

Flood everywhereEvery kind of event in Wyoming

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.