Storm Events Database

Event Details

Event Flood
-- Flood Cause Heavy Rain / Snow Melt
State WYOMING
County/Area FREMONT
WFO RIW
Begin Date 06/24/2011 01:45:00 MST-7
Begin Range 1
Begin Azimuth SE
Begin Location RIVERTON
Begin Lat/Lon 43.02/-108.36
End Date 06/30/2011 23:59:00 MST-7
End Range 8
End Azimuth WSW
End Location SHOSHONI
End Lat/Lon 43.19/-108.26
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 415.00K
Crop Damage 250.00K
Episode Narrative The 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. At the basin headwaters, the snowpack at the Togwotee Pass SNOTEL was unprecedented, surpassing that of the historic flood year of 1997. The result of the melting snow was record flooding along the lower Wind River from Kinnear to Riverton and downstream to Boysen Reservoir. More information regarding the conclusion of this flood episode can be found in the July 2011 Storm Data publication.
Event Narrative Melting snow caused the Wind River at Dubois to reach flood stage early on the morning of Friday, June 24. The flood waters surrounded sandbagged homes, inundating yards and a local campground. Continued snowmelt above the 9,000 foot elevation initiated a second surge of water toward the end of the month and early July.

Downstream the river rose several feet as other tributaries brought additional water to the Wind River. Also, increased water releases from the Bureau of Reclamation's Bull Lake Dam, which was quickly filling, allowed for additional water to reach the river channel. The Wind River gauge at Crowheart reached at least 10.86 feet during the early evening of Thursday, June 30, before failing. The Wind River flowed into its old river channel downstream of the Crowheart gauge. This caused water to surround several homes near the U.S. Highway 26 Wind River bridge crossing between Diversion Dam and Morton. Rising water overtopped and subsequently closed a good portion of a one mile section of the highway between mileposts 104 and 105. Traffic was diverted around this closure for most of the next week.

Through late June most of the flooding impacted farm and pasture land near the river from the Johnstown Bridge to Hidden Valley near Boysen Dam. Gauges on this stretch of river at Kinnear and Riverton continued to climb in early July. Similarly, the Little Wind River at Riverton also climbed above flood stage on June 30 and continued to rise during the first few days of July. High waters on tributaries of the Little Wind coupled with record flows on the Wind River created flooding near the confluence with the Wind River.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 415.00K 250.00K
RIVERTON FREMONT CO. WY 06/24/2011 01:45 MST-7 Flood 0 0 415.00K 250.00K
Totals: 0 0 415.00K 250.00K