Report of Investigations 35
Digital Landslide Inventory for the Cowlitz County Urban Corridor, Washington
by Karl W. Wegmann
This report contains a digital, map-based, expandable geographic information systems (GIS) inventory and database for identified deep-seated and shallow landslides within the Cowlitz County urban corridor, extending from slightly north of the Toutle River south to the Cowlitz County–Clark County boundary, and encompassing primarily non-commercial timber lands on either side of Interstate Highway 5. The products of this study consist of a GIS inventory of landslides as ESRI shapefiles and associated metadata, digital photographs of individual landslides, 1:24,000-scale landslide inventory maps for 7.5-minute quadrangles in the inventory area, and a 24 p. text.
The inventory contains specific information about each landslide, such as: landslide type; slide dimensions; certainty that the mapped feature is a landslide; inferred state of activity derived from geomorphologic and engineering data; whether the slide was previously identified in geotechnical, landslide inventory, or geologic mapping reports; geologic unit(s) involved; and affected infrastructure. The inventory is publicly available, and is intended to be of use for a variety of state, county, and city land-use planning and development purposes. This inventory should be considered an initial baseline for future site-specific landslide-related studies. It is not intended to be detailed enough to replace site-specific investigations by qualified (licensed) geologists and engineering geologists.
This publication supersedes Report of Investigations 34.
Two ways to obtain this product:
- Purchase a CD-ROM copy from the Washington State Department of Printing [ORDERING INFORMATION]
- Download an electronic version below
How to Download
Need help downloading these files?
To download digital data, you must agree to the terms and conditions of the DNR Data License Agreement.
Download as a Single Complete File
The entire report may be downloaded as a single ZIP file:
Download as Several Individual Files
For users who cannot download the complete report due to its size, or who only wish to use part of the report, it may be downloaded as four individual files.
For more information about the report contents, please see: