River Crossing

Publisher's blurb: This module contain three handy encounters for the time your players have to face a mighty river. The encounters are varied and can be faced with violence or wits, whatever you players choose to. The encounters leads from one to the other so you can run the three in the same session if you are lucky or you can save some for another river. The encounters are adjusted for characters level 1, level 3 or level 6. You reach the bank of the river but the bridge is not there, your calculations were a little of. The river runs strong and wildly. What do you do?