May 13, 2023
An unusually cold spring kept snowpack intact and in place over the Copper River Basin into mid May. Once temperatures started to warm, they did so quickly and rapidly melted snowpack in the basin. An additional snow event later in May repeated the process creating multiple events where snowmelt would impact Glennallen and Old Edgerton Highway from Moose Creek snowmelt, and Gulkana and Sourdough areas along the Gulkana River.
Source: NOAA National Weather Service Storm Events Database (event 1104522). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Copper River Basin County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.