Idaho –
“Eric Engle, an Army veteran and employee of the Corps, died of carbon monoxide poisoning on June 29 while operating a gas-powered pressure washer in a tunnel at the dam. The Corps said this week Engle’s death has prompted five separate investigations.”
Several agencies looking at Dworshak Dam death | Northwest | lmtribune.com
“A total of five investigations ensued including the Clearwater County Sheriff’s office, Clearwater County Medical Examiner, Federal OSHA, USACE Safety Investigation Board and an investigation under Army Regulation 15-6.”