Today the Denver Sluice complex not only manages the heart of the Great Ouse River System and a range of other river systems that converge at Denver, it also plays a key role in river navigation, conservation, water abstraction, agricultural and land drainage and fisheries. The operation of the Denver Complex and management of the Ouse Washes are also bound together. Maintaining the right balance for this range of interests whilst delivering the Complex’s main role for flood defence is hard to achieve all of the time.