Just to be clear, you mean this thing, right?
Correct.
The default image is not what I am asking about.
It appears to be connected to the Thousand Trails Pacific City RV park there, but it's not on the resort map linked on their site. If you really wanted to know I'd say calling that park would be your best follow up.
Helipad?
I thought it might be a helipad as well, but the proximity of the trees around it rules that out. Even if there was a skilled enough pilot with the right weather and air current conditions... It would be quite a challenging land. Let along take off. Why would there be a helipad there in the first place, was a following question I had, and couldn't determine.
It is twice the size of a small helicopter pad. It is on the high point in the area, and there's a large commercial for building just to the SW. I'm not disagreeing, but I'm at a loss othwrwise. Missle silo?
What is this thing?
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.