American hazelnut is a bush, not a tree. This is probably a picture of another Corylus species that grows into a tree.

Hi Cyclaminist. You are correct, the American Hazlenut is a shrub. But this shrub can get to be 18 feet tall. Mine is a very old specimen and has the multi-trunk form. I can take a photo of the entire shrub for you?
https://www.arborday.org/trees...
https://en.wikipedia.org/wiki/...

This is what mine looks like back in the woodland.
https://rockydale.wordpress.co...

Wow! I guess I don't know it as well as I thought I did. It would be cool if you took a picture showing the size and habit of your shrub. I'm curious though: American hazelnut isn't native to Oregon. Do you know if someone planted it?

It was planted around 1950, by the man and his wife that build this house. There are many treasure on the 1/2 acre that were planted by them. They also love native plants.
I'll see if I can get a photo some time today. I have a young man coming to help me with weeding today, so will try to fit a photo session in to the planned work. : )