2020 Map of Oso

About this map

The North Fork Stillaguamish River carves a deep valley through this portion of the North Cascades foothills, anchoring the small settlements of Oso and Halterman. The landscape is defined by the stark transition from the river bottom to the heights of Frailey Mtn and Ebey Hill. To the northwest, the shoreline of Lake Cavanaugh is lined by N Shore Dr and S Shore Dr, serving as a significant upland water body. The area's complex drainage network is clearly visible, with numerous tributaries like Deer Cr, Brooks Cr, and Rick Cr feeding into the main river system. The map documents the local road network connecting rural homesteads and timber lands, including Arlington-Darrington Rd and Oso Loop Rd, which follow the natural contours of the valley floor near Russell Spring.