Follow that recipe for safe river crossings. Plan . . . Stream currents are swift and cold, and the water level can rise significantly within a few hours, making a slow stream an impassable torrent.
Silt carried in the rivers can prevent a clear view of the obstacles along the bottom.
Pick . . . As water disperses it'll run more slowly and shallow out. Spend time walking up and downstream, or climbing to a high point, in order to find a crossing site suitable for the entire group. Watch . . . Don't cross through standing waves.