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Portland Arch Nature Preserve

Portland Arch Nature Preserve
Portland Arch Nature Preserve

Portland Arch Nature Preserve contains massive crossbedded sandstone cliffs and a seven-foot high natural bridge. The site has many plant species unknown elsewhere in Indiana, some of which are relicts occurring due to the unusual climate created by the canyon.

Location: Fountain County, IN

Year designated: 1973

Acres: 192

Ownership: State


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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