On what was once the southeast corner of the Rinearson Land, Gladstone's famous Pow-Wow Tree still stands. It is an important landmark in Gladstone's history and witness to clannish trade agreements, disputes and settlements, wedding ceremonies, burials and other such native community events. The tree also marked the entrance to the first Clackamas County Fair (1860) and the first Oregon State Fair (1861), which were held along the banks of the Clackamas River

During the Civil War, this same fairgrounds served as a place to muster cavalry volunteers for the federally authorized local militia. The PowWow Tree is located on Clackamas Blvd., one block west of Portland Ave.