My only success on Duwamish silvers has been with eggs. I like small baits and small hooks with a tiny flo red corky. Fish seem to like it, also. You have to have some tidal run to drift effectively in this stretch of the river. I've caught most fish while the tide is running out, but have also taken fish when the tide is incoming and your drift is upriver. Take plenty of leaders; the lower river is a snagfest. Take time to scout the river on an extreme low tide and you will save yourself some gear. Good luck and thanks for the info about the opening.