Resource
Bonasa Breaks Ranch Dam Dam Failure and Hydrologic Report
Resource Type
Reports
Reference Title
Bonasa Breaks Ranch Dam Dam Failure and Hydrologic Report
Organization/Agency
WA State Department of Ecology
Year
2017
Date
08/21/2017
Document Number
17-11-008
Topic Location
Washington
Abstract/Additional Information
This report summarizes the Dam Safety Office’s observations and findings of our May 3, 2017, inspection of the breached Bonasa Breaks Ranch Dam, and our subsequent engineering analyses. Our primary objective was to determine the causes of the April 13, 2017, dam breach failure of the Bonasa Breaks Ranch Dam by evaluating the hydrologic response of the reservoir and spillway to potential and design hydrologic and hydraulic operating conditions.
