Inland navigation had played a key role for physical distribution in earlier times. As railwayand road had developed, however, inland navigation had declined. Recently, inland navigation draw renewed attentions from the aspects of reduce of physical distribution cost and global environmental problem.
In this study, the ice thickness were surveyed at the area that assumed the route of Ishikari inland Navigation. And field test and laboratory test about the flexural strength of snow ice and freshwater ice are carried out.
