2020 Map of Cascadia

About this map

The South Santiam River winds through the heart of the Willamette National Forest, defining a landscape of dramatic elevation changes and significant water features. This 2020 survey documents the complex topography of the Cascade Range, where Green Peter Lake forms a major reservoir to the north, creating distinctive landforms like the Green Peter Peninsula and Whitcomb Island. The area is marked by several named waterfalls, including Upper Soda Falls, Lower Soda Falls, and Rainbow Falls, which highlight the steep drainage systems of creeks like Moose Cr and Dobbin Cr. Transportation across this challenging terrain is facilitated by Cascadia Dr and forest development routes such as High Deck Rd 2025, with the Garland Bridge providing a critical crossing over the river. The map also traces the prominent ridgelines of High Deck and Moose Ridge which separate the various canyon drainages.