Open water at Fairbanks to Nenana Stop 4 Photo Credits: Chas Jones Open water along the Tanana River. This condition appears to be the result of groundwater upwelling in the area. Process Observed: Open WaterIce CollapseGroundwater Upwelling Date Process Observed: Tuesday, April 16, 2013 Galleries: Fairbanks to Nenana Trip Stop 4 Gallery