CAEA573013 - OSHAWA HARBOUR Canadian Hydrographic Service Central and Arctic Region SILTING Owing to continual silting the depths are constantly changing. Dredging is carried out periodically to the depths shown but mariners are cautioned that varying amounts of refilling must be expected. See Notices to Mariners for subsequent corrections on this chart and Notices to Shipping in force for hazards or changes essential for the safety of navigation © Fisheries and Oceans Canada 2019. Published by the Canadian Hydrographic Service. A licence is required from the Canadian Hydrographic Service (www.charts.gc.ca) to reproduce or distribute this work.