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William L. Finley National Wildlife Refuge is a natural area in the Willamette Valley in Oregon, United States. It was created to provide wintering habitat for dusky Canada geese. Unlike other Canada geese, dusky Canada geese have limited summer and winter ranges. They nest on Alaska's Copper River Delta and winter almost exclusively in the Willamette Valley. Habitat loss, predation, and hunting have caused a decrease in population. Located ten miles south of Corvallis, Oregon, the refuge protects many of the historic habitats of the valley, including the largest remaining tract of native Willamette Valley wet prairie. Fields of wildlife food crops are interspersed with Oregon white oak savannah, meandering creeks with bottomland Oregon ash forest, old growth bigleaf maple, and native prairie. Other management goals are to preserve native species and enhance biodiversity including the rare oak savannah, upland prairie, and wet prairie habitats. Endangered and threatened species such as Oregon chub, and Bradshaw's desert parsley find protection and sanctuary on the refuge. A herd of Roosevelt elk can be found in the bottomland forests or farm fields on the refuge. Under cooperative agreements, area farmers plant refuge fields to produce nutritious grasses preferred by geese. The geese also need water for resting and foraging habitat. Many refuge wetlands occur naturally; others are created by dikes and levees.