It was discovered in 1827 by Captain James Stirling and named by Stirling after Vice-Admiral Sir Henry Blackwood, under whom he served as a Midshipman on HMS Warspite in 1808-1909 during the Napoleonic Wars, in the North Sea and the Mediterranean.
Funding has been allocated to provide fencing to land owners and a reserve connecting the Forest Grove and Blackwood River National Parks to assist the protection of the riparian habitat.
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Both the Blackwood River and the Scott River discharge into the north eastern end of the inlet.