Egg

Sorry it took me so long to get back to you. I am the same guy as crasher but a bit older. I found this near a lake in Montana. In order to get down to the beach I had to go down a steep hill. I saw it on a little flat spot on the hill. I went through a bunch of plants to get it. Then I took it home and took this picture a year after I found it

Interesting spotting. Unless you see either bald eagles or golden eagles regularly in your area, I guess it is not possible to identify the species. However, it could be added to the category of birds, which I did for you. Perhaps you can describe how you found it, please?