Open water at Hotcake Slough-Main study site Photo Credits: Chas Jones Location in Hotcake Slough where scientific instruments have been installed to monitor temperature, groundwater, ice and snow. Portions of Hotcake Slough remain ice-free in most years. Process Observed: Open WaterGroundwater Upwelling Date Process Observed: Monday, February 6, 2012 Galleries: Hotcake Slough - Main Gallery