Salt water enters the freshwater system of Lake Washington, Montlake Canal, Lake Union, Fremont Canal, and Salmon Bay through the U.S. Government Locks at Ballard….
Rattray, Maurice, G. R. Seckel, and C. A. Barnes. 1955. "Salt budget in the Lake Washington ship canal system." Journal of Marine Research 13, (3). https://elischolar.library.yale.edu/journal_of_marine_research/819