QUOTE (Voran @ Sep 9 2013, 09:56 PM)
Do Tugboats operate on Lake Union/Lake Washington? Do big commercial ships? or does the size of the locks/canal system prevent big ships from moving from the Puget Sound into the lake system?
Tugboats, yes. They're really not that big. Big commercial ships, no; the ship canal isn't that big, and it's mostly used for pleasure craft and fishing vessels (kinda like the ones on Deadliest Catch, several of which are based in Seattle).
QUOTE
Could you take a warship like...I dunno a Destroyer or something, and move it through the canal system and park it in Lake Washington?
I'm not sure how big a destroyer is nowadays, but I know back in the old days, they used to send them through. There's pictures of destroyers going through the Locks at the visitor center, mostly from the pre-WWII days. A carrier wouldn't fit, but probably a small, older destroyer (like the size of the Arizona) could still make it.
Edit: Here's the
Wikipedia page on the Ballard Locks, which is the choke point for the Ship Canal. The bigger one is about 80ft/24m wide, so anything thinner than that should be able to make it. A Burke class destroyer is listed as a beam of 66ft/20m, so while it'd be a tight fit, it could squeeze through.