Looking at your photos, the bottom of the trunk seems to indicate a combination of insects such as the flat headed borer or engraver beetles (hence the woodpeckers) and some disease such as Armilleria root disease or stem canker problems. Trees have a way of ignoring the odds and surviving but it looks to me like it's odds aren't great. But it's alive so give it the benefit of the doubt - give it regular, deep watering and maybe some nitrogen fertilizer and see what happens. If it dies then at least you gave it your best shot. Good luck!
Here's a link to a website on disease problems.
https://extension.oregonstate.edu/forests/tree-care/diagnosis-table-douglas-fir-oak-pine