River Foss - River Modifications

River Modifications

The Foss Barrier is built across the river near its mouth at Castle Mills. When closed, it prevents floodwater from the River Ouse flowing up the Foss and flooding parts of York. Water flowing down the Foss can be pumped over the top of the barrier and into the Ouse. Castle Mills Lock is 34 metres long and 6 metres wide. There are mooring points in the lock basin on the River Ouse side with overnight mooring on the River Foss prohibited. Beyond Rowntree Wharf there are few opportunities for turning.