Below Denver , the situation was complicated by the fact that there were six bodies with responsibility for the river in 1913 . No dredging took place , as there was no overall authority . The training walls were repaired in 1930 by the King 's Lynn Conservancy Board , and the Great Ouse Catchment Board reconstructed and extended them in 1937 . After major flooding in 1937 and 1947 , and the North Sea flood of 1953 , flood control issues became more important , and the Cut-Off Channel was completed in 1964 , to carry the headwaters of the River Wissey , River Lark and River Little Ouse to join the river near Denver sluice . The Great Ouse Relief Channel , which runs parallel to the main river for from here to Wiggenhall bridge , was constructed at the same time . It joins the river at a sluice above King 's Lynn , and was made navigable in 2001 , when the Environment Agency constructed a lock at Denver to provide access
North Sea flood of 1953
North Sea flood of 1953
River Great Ouse