Hanford Reach NM White Bluffs Landslides 1996-2021

The White Bluffs Landslides geospatial dataset was produced by the Department of Geology at Portland State University in 2024 for Central WA National Wildlife Refuge Complex, U.S. Fish and Wildlife Service. Using orthorectified aerial photographs from 1996 to 2019, supplemented by airborne lidar and field verification, landslides were mapped digitally in GIS at ~1:2000 scale with boundary accuracy of ±5 meters. Landslides were classified according to characteristic features and types, including earth flows, rotational slides, compound slides, and earth spread. Each landslide was assigned to the year it first appeared in photographs, noting that actual occurrence may be earlier, and regrowth of vegetation can obscure mapping after several years. The mapping process included identification of new landslides and expansion events, with boundaries refined using lidar and in-field observations. This dataset is intended to inform resource management decisions within the White Bluffs region of the Hanford Reach National Monument. ServCat Project: https://iris.fws.gov/APPS/ServCat/Reference/Profile/193322 This description was drafted with the assistance of Copilot AI, May, 2026, using a final report submitted by Adam Booth, Department of Geology at Portland State University to fulfill an Agreement between USFWS and Portland State University.