Clackamas Wilderness, Protected wilderness area in Mount Hood National Forest, Oregon

Clackamas Wilderness is a 9,470-acre (3,830 ha) wilderness area in Mount Hood National Forest, in the northwestern Cascades of Oregon. It is made up of five roadless tracts — Big Bottom, Memaloose Lake, Clackamas Canyon, Sisi Butte and South Fork Clackamas — on a 50-mile (80 km) stretch on both sides of the Clackamas River. It holds some of the biggest trees in northwest Oregon.

Congress designated this area as protected wilderness in 2009, officially ending any future development or logging. This legal protection ensures the forest remains in its natural state for generations to come.

The name comes from the Clackamas people, whose territory centred on the Clackamas River. The wilderness also holds Memaloose Lake, whose name derives from the Chinook Jargon word for the dead; such lakes were used for burial, so visitors should treat the site with respect.

The five roadless tracts lie along a 50-mile (80 km) stretch of both sides of the Clackamas River. The Memaloose Lake trail climbs through forest to the lake and continues a mile to a viewpoint on South Fork Mountain. Trails are unmarked in places, so carry a map and expect wet, slippery ground.

The five tracts are spread over a 50-mile (80 km) stretch on both sides of the Clackamas River, and none of them carries a road. The designation came with the Omnibus Public Land Management Act of 2009, which set the total at 9,470 acres (3,830 ha).