The Butternut tree is usually smaller than it's cousin the Black Walnut, but the bark and catkins tells me it could be a very large Butternut. Butternuts prefer a colder climate than the Walnut, so the location of the tree corresponds especially if it's growing at altitude. Butternuts can reach 3' in dia. and 90' tall. Tea made from the inner bark was used as a laxative and dye for cloths ect. I have also used it's nut hulls as well as the walnut's hulls as a trap dye. Wood is soft and not considered a good bow wood. The bark bark and size of the tree however points to the tree being a B. Walnut. Butternut bark is a medium grey color with a simular texture. From the picture I would say it's a Black Walnut.