Elk Rock Island

Elk Rock Island is an island within the Willamette River in the U.S. state of Oregon. The 12- to 13-acre (4.9- to 5.3-ha) island, formed 40 million years ago by a volcano, was given to Portland by Peter Kerr in 1940. The island contains deciduous forest, mixed evergreen-deciduous forest and perennial graminoid vegetation.