wrote:
To the casual observer, it can appear that the fresh waters inside the
locks in Seattle merely had to be "connected" with a couple sections of
canal to permit navigation between Puget Sound and Lake Washington. In
reality, the operation was for more complex. The lakes were at differing
levels, draining to a brackish tideflat where hundreds of boats and ships now moor.

Some details and some old photos describing the engineering challenges at

http://www.digital.turn-page.com/i/183009/3

Good mag. One addition I would add is in the places you report on, include
showers, B&B or lodging. Some cruisers may want or need those facilities,
or They may like me with smaller craft, that get a slip and lodging.