Willamette Floodplain

The Willamette Floodplain consists of 713 acres (289 ha) of natural grassland, near the Willamette River, that was made a National Natural Landmark in May 1987.^[1] The floodplain is within the William L. Finley National Wildlife Refuge and located about 10 miles (16 km) south of Corvallis in Benton County, Oregon.

Willamette Floodplain
Grassland of the Willamette Floodplain
Location	Benton County, Oregon, US
Nearest city	Corvallis
Coordinates	44°24′49″N 123°17′57″W
Area	713 acres (289 ha)
Designated	1987 (1987)
Administered by	U.S. Fish and Wildlife Service

It is the largest remaining native unplowed example of bottomland interior valley grassland in the North Pacific Border natural region. It was classified as a natural landmark because such grassland and shrubland areas are exceedingly rare, with most having been cultivated or turned into pastureland.