Osprey it is. I think adolescent waiting to see if mom might just show up with a fish. :)
Those ropes are bailing twine used to hold hay bales together. Though they seem to be doing a really good job holding the nest together (Did you note that it's a 'man built' platform for it?) they are made of plastic and become plastic waste.
Cool pictures of a cool bird.
Looks like it was a man made wood platform
Yep. They are pretty common in the inland Northwest. The power companies build some of them to keep the birds from nesting on the power poles.