Manitoba News Release - De. 3, 2010 Manitoba Water Stewardship's Hydrologic Forecast Centre has issued a high water advisory for the Assiniboine River and its tributaries, from the Shellmouth/Russell area to Headingley, as a result of ice jams. Shellmouth Dam (above) in more normal times. Also see photo (below) just below the dam. Pics by l.p. · The Assiniboine tributaries and the main river remain well within their banks at most locations. However, due to the recent heavy snow followed by a sudden drop in temperatures, ice jams and flooding are occurring at various locations downstream of the Shellmouth Reservoir, Miniota and in the Brandon area. · This local ice-jam flooding is expected to continue at locations on the main river and some larger tributaries like the Souris and the Little Saskatchewan rivers until the freezing process stabilizes in the next two weeks. · Communities in the Assiniboine Valley, especially in low-lying are