New Flood and Action Stage Changes for the Susitna River at the Parks Highway

and the Nuyakuk River near Dillingham

On April 18, 2021, the National Weather Service (NWS) Forecast Office in Anchorage, Alaska and the Alaska-Pacific River Forecast Center (APRFC) will be making stage changes on two different rivers in Southern Alaska.

Susitna River

An action stage for the Susitna River at Sunshine, which is where the Susitna River crosses the Parks Highway will be added. An action stage is the approximate level of bankfull flow, and is below minor flood stage. The minor and moderate flood stages remain unchanged.

For the Susitna River at Sunshine:

                                                          Action Stage           Minor Flood Stage           Moderate Flood Stage

                                     Previous       None                       24.5 feet                           27.5 feet

                                     New              21.0 feet                 24.5 feet                           27.5 feet

Nuyakuk River near Dillingham

There will be an action stage added, and a change for the flood stages for the Nuyakuk River near Dillingham. Flood stages were changed due to a flood frequency analysis as well as observations from previous flood events.

For the Nuyakuk River near Dillingham:

                                                         Action Stage             Minor Flood Stage

                                     Previous      None                         12.0 feet

                                     New             9.5 feet                      11.0 feet