Storm Events Database

Event Details

Event Flood
-- Flood Cause Heavy Rain / Snow Melt
State WYOMING
County/Area FREMONT
WFO RIW
Report Source River/Stream Gage
NCDC Data Source CSV
Begin Date 2011-07-01 00:00:00.0 MST-7
Begin Location 1SE RIVERTON
Begin Lat/Lon 43.02/-108.36
End Date 2011-07-11 08:15:00.0 MST-7
End Location 8WSW 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 100.00K
Crop Damage 500.00K
Episode Narrative Water 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. More information regarding the onset of this flood episode can be found in the June 2011 Storm Data publication.
Event Narrative Flood waters continued to travel down the Wind River through Fremont County in early July. Continued mountain temperatures in the 60s and lower 70s allowed for an unprecedented late-season snowpack to rapidly melt. This active snowmelt quickly filled creeks, streams, and smaller reservoirs feeding the Wind River. The result was record and near record flows on the Wind River from Dubois to Riverton.
The river crested at 5.59 feet in Dubois around 0600MST on Friday, July 1. This was just short of the 5.66 foot record set in June 1956. Flow at the Dubois gauge was calculated at nearly 2,000 cfs. Homes near the river in Dubois were surrounded by water but, other than crawl spaces, no homes were flooded.
Farther downstream at Kinnear the river rose to a record height of 9.69 feet at 0130MST on Saturday, July 2. This reading easily surpassed the previous record of 8.97 feet set in June 1997. Flow on the morning of the 2nd measured 13,586 cfs. Farm and pasture land near the river was completely inundated, in some cases 1/4 to 1/2 mile away from the main channel.
The peak river stage of 11.80 feet occurred on the Wind River at Riverton at 1000MST on July 2. This stage completely shattered by nearly one foot the previous record set in June 1997. Peak flow was measured at 11,759 cfs. Water inundated the Riverton Rendezvous site between Friday and Saturday and disrupted the annual rendezvous. Otherwise, flooding was confined to farm and pasture land, which was particularly pronounced on the east side of Riverton north to Hidden Valley. Flooding of the Little Wind River near the confluence with the Wind River produced much of the same in terms of lowland flooding. The Little Wind River crested just short of 9.0 feet early on July 2, nearly one foot above flood stage. The river fell below flood stage early on Sunday, July 3, following the passage of the Wind River crest wave through Riverton.


     ‚Äč



All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 100.00K 500.00K
RIVERTON FREMONT CO. WY 07/01/2011 00:00 MST-7 Flood 0 0 100.00K 500.00K
Totals: 0 0 100.00K 500.00K