For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Wallula Gap is the largest, most spectacular, and most significant of the several large water gaps through basalt anticlines in the Columbia River basin.
Year designated: 1980
Ownership: Federal, Municipal, Private
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