The Mount Hood National Forest is east of the city of Portland, Oregon, and the northern Willamette River valley. The Forest extends south from the Columbia River Gorge across more than of forested mountains, lakes and streams to the Olallie Scenic Area, a high lake basin under the slopes of Mount Jefferson. The Forest includes and is named after Mount Hood, a stratovolcano. The Forest encompasses some . Forest headquarters are located in Sandy, Oregon. A 1993 Forest Service study estimated that the extent of old growth in the Forest was . The Forest is divided into four separate districts - Barlow (with offices in Dufur), Clackamas River (Estacada), Hood River (Mount Hood-Parkdale), and Zigzag (Zigzag).