York Historic Environment Record

This monument record marks the location of a dam constructed in 1067 by William 1. The dam was constructed with the intention of flooding the newly-excavated ditches of York Castle. As well as creating these water defences for York Castle, the dam also flooded the valley of the river Foss creating a large artifical lake. This became known as the King's Fishpool. The monument has not, as yet, been observed in archaeological interventions.