Hundreds of rowers should find out tonight whether the historic 'Town Bumps' will go ahead in Cambridge tomorrow.
Heavy rain caused the River Cam to burst its banks over the weekend.
A large willow tree near the Fort St George pub has fallen into the river and is blocking much of the waterway. Organisers are worried high water levels, fast currents and flotsam could make conditions too dangerous for rowers.
The Bumps is a staggered rowing race which dates back to 1820. Crews start one and a half boat lengths apart and race to catch and 'bump' the boat in front of them without getting 'bumped' first by the boat behind them.
The event is scheduled to start tomorrow and run until Friday. The Cambridgeshire Rowing Association are meeting at 7.30 tonight to decide whether the river is safe enough for the race to go ahead.
This footage illustrates conditions on the River Cam.