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Landslide Hazard Areas
Alpenridge Slide
Landslide hazard areas are areas potentially subject to landslides based on a combination of geologic, topographic, and hydrologic factorrs.  They include areas susceptible because of any combination of bedrock, soil, slope (gradient), slope aspect, structure, hydrology, or other factors. 

Modification of topography and vegetation in landslide hazard areas is carefully regulated in order to preserve long-term stability of sensitive slopes, reduce erosion potential and stormwater runoff, and preserve related ecological values.

Map Sources
Department of Natural Resources Landslide Study 2006 - Digital Landslide Inventory, Cowlitz County, WA.  Wegman, 2006 (I-5 Corridor Study)

USGS Pacific Northwest Urban Corridor Geologic Maps  

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