Dang. And yah know what? Probably all the pilots that fly out of PA and Astoria all know about that wire because they all fly in that area all the time. Local knowledge. But those guys from Sitka probably wouldn't know those kinds of details.
In transit... I'd bet running the shoreline low and fast to make the flight a little more interesting on their way up... and a ~beautiful~ flight it is.
Nuts.
I am guessing you are correct. We have a place on the coast near the Astoria base and see them doing just that quite often heading north.