Secret bases, such as the most infamous Area 51, have been part of the UFO and conspiracy world for ages now. Aside from the mentioned, there a few others that are almost household names for anyone familiar with UFOs, such as Dulce base in New Mexico or Camp Hero (not quite secret and home of the Montauk Project, which I know almost zip about) in New York. There are rumored to be many more across the US and the rest of the world, so just for the heck of it, I looked up some rumored to be in my state. I didn't find to many results, but enough that it's sparked my interest more. If I knew who to ask, I'd be digging around for more info, maybe try my hand at free lance journalism, and who knows possibly find a little bit of the truth.
So here we go, the first base in Oregon that I found is located around the Lincoln City area (on the gorgeous Oregon Coast) in the Van Duzer Corridor. There people have seen everything from weird lights to army bases somewhere in the woods. One couple apparently even had some missing time out in that area, which tends to be a good sign of alien abduction.
Not surprisingly that is about the only base in Oregon I can dig much up on. That doesn't mean that there aren't others though. One of Oregon's most recognizable landmarks, Crater Lake, is said to be home to underground tunnels that link up to Cave Junction (apparently there are at least 36 old mine shafts there) Oregon, in an underground UFO base.
Other then that, Wilmer, Oregon, and Klamath Falls, Oregon are rumored to have some UFO or secret base connections. At least to an extant, Wilmer for sure does because it apparently has some underground chemical storage out that way.
So the official Naveed's Realm tally for the number of UFO or hidden military bases in Oregon is 6! I think at least. I guess you could consider the Crater Lake and Cave Junction part one base if you wanted since they apparently connect, but that would make the tally go down...and that's just not very fun...or cool...not to mention there is enough shrink going on in the current world economy, so let's just leave the tally high shall we?
Sources and further reading:
Oregon Coast Ghost and Other Paranormal Legends
Underground Base List
Boyer Oregon, Paranormal Activity