Here's a link to a dive site map for
Ft. Worden.
It's an easy dive at slack. Even if there's a slight current you can do it as a drift dive. Of the three dives I've done there the maximum depth was 36ft (not sure if that was a low tide). So NDLs are not a problem!
You can also dive around the pilings at the marine science center, or start or end there a dive there. It's even shallower (10-25ft) but there's lots of nice growth. Either way, be aware of any boat and jetski traffic -- shouldn't be too much of a problem at this time of the year.
If you have the time and transportation, I suggest going over to
Point Hudson as well. It's about a 4 minute drive from Ft. Worden. Point Hudson is at the end of Water Street in downtown Port Townsend (see dive site map). IMO it's much more interesting, albeit more challenging due to higher exposure to currents. Along the rocks towards the end of the breakwater we regularly see an octopus and other cuddly critters. And there you can go as deep as you'd like...
If you need a buddy let me know. If I'm free, I'd be happy to do Ft. Worden again -- and I'll do Hudson at any slack tide!
Regarding Ft. Casey, the Keystone jetty (next to where the ferry arrives) is the place to go there. I don't know about any other diving in the Fort Casey area. Keystone is just as good as Pt. Hudson, arguably better. It's just a hassle to get there because you have to take the ferry from Port Townsend.
glenn