1978 Map of Diamond Lake

About this map

The North Umpqua River and its major tributaries, including Steamboat Creek and the Clearwater River, carve through the complex topography of the Calapooya Mountains. This 1978 revision, compiled from mid-century surveys, shows a landscape defined by massive public land holdings, where the Willamette National Forest, Umpqua National Forest, and Rogue River National Forest converge. The high-elevation eastern terrain is dominated by volcanic features like Mt Thielsen and Mt Bailey, alongside the expansive Pumice Desert. Significant water bodies such as Diamond Lake, Crescent Lake, and Summit Lake serve as primary landmarks in this wilderness-heavy region. The infrastructure is sparse, noted by the presence of the Toketee Landing Strip and remote ridges such as Ragged Ridge and Reynolds Ridge, reflecting a period focused on forest management and backcountry recreation.