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The Montlake Cut, between the Montlake and University District neighborhoods in Seattle, connects lakes Washington and Union as part of the Lake Washington Ship Canal. When it was completed in 1916, it marked the realization of a 62-year-old idea to link the lakes with Puget Sound, creating a freshwater harbor in Seattle and a waterway connecting Seattle's shipping harbor in Elliott Bay with the resource-rich interior of King County.
The canal boosted economic development on the lakes and helped reduce flooding in the Duwamish River valley (Lake Washington's former outlet), but it also had far-reaching environmental and cultural consequences.
Visit HistoryLink.org to read more about the Montlake Cut.