Mar 18, 2019
Minor flooding occurred along the Cheyenne River from upstream of Wasta to Lake Oahe due to releases from Angostura Dam, snowmelt, and ice jams. On March 15, releases began from Angostura Dam through the radial gates. With ice still in the river, the water began cutting away at the ice, causing large chunks of ice to make their way downstream. A large ice jam formed just downstream from the gage near Wasta. As water backed up behind the jam, minor flooding was observed. The ice jams continued to
Source: NOAA National Weather Service Storm Events Database (event 814986). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Pennington County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.