Back on March 22nd, Mary Gorjance sent us that photo of an SDOT crew installing the new “Duwamish Waterway” sign at the crest of the high bridge. We later noticed an identical sign newly installed on the low bridge. We hadn’t gotten around to asking SDOT about the new signs … but tomorrow morning we’ll get the backstory, as a media briefing is planned near the one on the low bridge. The announcement from the city says that representatives of the Duwamish Tribe and Southwest Seattle Historical Society will be there along with City Councilmember Lisa Herbold, to “discuss the significance of the Duwamish River to the City of Seattle and the importance of the ‘Duwamish Waterway’ signage.”