on commission. His son, Don J. Bobo, Teanaway Valley, Washington, inherited his father's collection of about one ton of petrified wood. Inundation In 1963, Wanapum Dam was completed about four miles (6 km) downstream, raising the water level of the Columbia River. A new Interpretive Center was constructed and about 60 petroglyphs salvaged from the rising water. Many of the salvaged petroglyphs are on display at the Interpretive Center. Recognition In October 1965, the National Park Service designated the Ginkgo Petrified Forest as a National Natural Landmark. Petrified wood was named the Washington state gem by the state legislature in 1975. Activities and amenities The park museum has displays of both petrified wood and Wanapum petroglyphs. The park's Trees of Stone Interpretive Trail follows an exposed section of prehistoric Lake Vantage past 22 species of petrified logs that were left where they were discovered in the 1930s. The trail includes a 1.5-mile loop through sagebrush-covered hills and a longer 2.5-mile loop. The park also has of Columbia River shoreline with swimming and boating access as well as camping facilities. References External links Ginkgo Petrified Forest / Wanapum Recreational Area Washington State Parks and Recreation Commission Ginkgo Petrified Forest Map Washington State Parks and Recreation Commission Wanapum Recreational Area Map Washington State Parks and Recreation Commission State parks of Washington (state) Ginkgo Petrified Forest Museums in Kittitas County, Washington Natural history museums in Washington (state) Geology museums in the United States Petroglyphs in Washington (state) Native American museums in Washington (state) Civilian Conservation Corps in Washington (state) Parks in Kittitas County, Washington Protected areas established in 1938 Petrified forests Fossil parks in the United States Paleontology in Washington (state)