Some of the oldest rocks in Portland are thought to be housed on this ancient island called Elk Rock. Formed from a volcanic eruption over 40 million years ago, this island was created by lava flows and features seven distinct habitats in its 13 small acres.
Wetlands, forest and grasslands can all be found at this beautiful natural area, teeming with trails for exploration.
Bill Reynolds / Flickr
Made up predominately of Waverly Heights Basalt, these large and jagged rocks predate Columba River Basalt, a more common rock in the area thought to be 10 to 25 million years old.
brx0 / Flickr
Named after Elk Rock, the high cliffs across the river, this island was included in a donation land claim in 1860.
Matthew Nenninger and Tracie Andrews / Flickr
Six owners later, Portland businessman Peter Kerr acquired the property from the Rock Island Club in 1910. At the time the island was home to a dance hall.
Mathew Nenninger and Tracie Andrews / Flickr
Kerr gave the land to the city with one requirement: it must remain in its natural state. The park was dedicated in 1954 and has remained a wilderness haven for decades.
Matthew Nenninger and Tracie Andrews / Flickr
The island is connected to the city by a 40-million-year-old land bridge and is only accessible when the water is low.
brx0 / Flickr
Access Elk Rock Island at the Spring Spring Park Trailhead on SE 19th Avenue and Sparrow Street in Milwaukie.
brx0 / Flickr
Enjoy the winding trails that wrap around the bay for a fascinating look at one of our area’s oddest geological wonders up close.
OhioCapCity / Flickr
Have you been to Elk Rock Island? What do you think of this natural oasis in the city? Let us know in the comments below.
Bill Reynolds / Flickr
brx0 / Flickr
Matthew Nenninger and Tracie Andrews / Flickr
Mathew Nenninger and Tracie Andrews / Flickr
OhioCapCity / Flickr
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