Duffins Creek is a productive tributary of Lake Ontario located in the Durham Region east of Toronto, flowing through communities including Pickering, Ajax, and Whitevale before emptying into Lake Ontario. The creek is narrow and generally clear, making water clarity and level critical factors in fishing success. The best action consistently comes a day or two after rainfall has raised and colored the water, drawing fresh migratory fish upstream. The creek supports a remarkable diversity of seasonal fishing, from resident brook trout in its upper reaches to impressive runs of rainbow trout, brown trout, coho salmon, and chinook salmon in its lower sections. The Whitevale Dam serves as a key structural feature, acting as a physical barrier that separates migratory salmonids in the lower creek from native brook trout populations upstream.