Cafodd waliau pentyrru dur hir eu gyrru i mewn i'r ddaear i greu argloddiau newydd ar hyd darn 2.6km o'r afon, rhwng Pont Wysg Rheilffordd y Great Western a'r M4.
The flood scheme, comprising sheet pilings, new walls and new embankments was built along a 2.6km stretch of the river, between the Great Western Railway Usk Bridge and the M4.