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1997 Map of Illahee Rock

Name: 1997 Topographic Map of Illahee Rock
Creator: U.S. Geological Survey
Published: 1999
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1999

About this map

The North Fork Umpqua River carves through the center of this landscape, defining the topography of the Umpqua National Forest in the late 1990s. The small settlements of Illahee and Flats sit along the river's path, where the valley floor widens enough to accommodate habitation. This area is a critical node for forest infrastructure and power generation, anchored by the Soda Springs Power Plant and supported by the Marsters Bridge river crossing.

Upriver, the terrain rises sharply into the protected Boulder Creek Wilderness, marked by distinctive geological features like Illahee Rock, Eagle Rock, and the Devils Stairway. Several quarries indicate active resource extraction in the surrounding hills, while named ridges like Eagle Ridge and Bradley Ridge frame the drainage basins of Rattlesnake Creek and Boulder Creek. A Gaging Station near Boulder Flat underscores the importance of water management in this river-dependent system.