Find Your Park logo
Read about the Newest National Natural Landmark
NNL 50th Anniversary

For the more information about the air resources of the National Park Service, please visit

Willamette Floodplain

Willamette Floodplain
Willamette Floodplain

Willamette Floodplain represents the largest remaining native unplowed example of bottomland interior valley grassland in the North Pacific Border biophysiographic province. All of these grassland and shrubland communities have become exceedingly rare as most have been cultivated or converted to pastureland.

Location: Benton County, OR

Year designated: 1987

Acres: 713

Ownership: Federal

For additional information see:

← Back to NNL listing for OR.

← Back to listing of all states and territories.

Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.

Last Updated: June 28, 2012