Er..."Z Nation" filming location....?

Can any of our American members by any chance identify the WW2 era defensive works that provide the backdrop to the last ten minutes of the last episode of series three of the SyFy Channel's "Z Nation"???

 

Got any screen shots ?

 

Only small, poor ones off the net...

 

I know, I know - useless LOL

But two things leap out from other shots - the finale action takes place in two different AA gun positions. As it's a relatively low budget production, I can't see them shifting filming between two different places - so both these are at the same location.

By definition, as "All outdoor scenes filmed in and around Spokane", it's somewhere on the coast of Washington state? Or that's a wide river in the background...

 

WAIT A SEC!

Got it It's Fort Casey on Puget Sound.

http://www.whidbeynewstimes.com/news/zombies-just-warming-up-at-fort-casey/

God I'm good

 

video of it
https://www.youtube.com/watch?v=PRUSgtfU8ws

 

A place I've been to by jove!
didn't see any zombies though....