To the untrained eye (or even 99% of the world, trained or not!) this looks like an old decrepit billboard, like you would see with "South of the Border" advertisements on it. Or maybe Stuckey's.

The actual story is much more interesting, at least, to us old radar guys and probably most hams who have worked with VHF and above.

https://imgur.com/a/ICz6juj

With having access into the Portland Watershed allowed me to capture these photos of the old microwave reflectors they used to use for their (edit:) video link and UHF radio system. The links linked a tower on a nearby hill down into the watershed near the lake, then bounced that signal to another microwave dish at Bear Creek House. It then was sent to a nearby hillside in the trees to a reflector, then ANOTHER reflector, then to a microwave transceiver at the Screenhouse.

The link worked OK but with the first link mentioned above, it beamed a link across the surface of the lake water. This produced reflections that sometimes created high BER.

The whole link from end to end was 10.78 miles.

Today, none of these reflectors are in use and just stand there as testimony of a service once used.

Lakeside = 45°29'23.65"N 122° 2'41.77"W

Bear Creek House = 45°28'54.84"N 122° 5'8.52"W

In the woods = 45°27'56.27"N 122° 5'13.23"W

Another one = 45°26'52.75"N 122° 9'8.73"W

Screenhouse = 45°26'54.36"N 122° 9'14.65"W

Thanks to the original poster on Reddit, u/mrk2 from the original here

(And just to lend credence to this story, there is even a model number and serial)