Amateur video has captured the "tidal wave" effect on the Zulg River, which runs right through the town of Steffisburg.
The dramatic footage was captured by an onlooker, showing large trees and parts.
(LiveLeak: The river, which is known to swell quickly, rose an additional five metres yesterday afternoon due to the persistent rain.
Traffic in neighboring towns came to a standstill as emergency services
were forced to block off several bridges leading over the river.
It is not known if anyone was injured from the flash flooding.)