The Antique Powerland Museum in Brooks, Oregon has 2 wigwags on their site.
One is located within the Oregon Electric Railway Museum (located within the Powerland grounds),
and the other is located within the Willow Creek Railroad live steamers area.
We do know that the signal at the trolley museum operates, not sure about the Willow Creek wigwag.
You can visit their website for more info on the museum...

Oregon Electric Railway operation at the museum.

Willow Creek Railroad wigwag. (above 3 photos by Erik Halstead)

Below are a couple older photos from Robert Ulberg (2/2002)