Holger "Hal" Jensen, formerly of Everett, apparently slipped Monday on icy concrete and fell about 35 feet onto concrete at a construction site at the Pinto Dam east of Ephrata.
Jensen, 62, was taken to Samaritan Healthcare in Moses Lake but died.
The Grant County sheriff's office said this week the state Washington Labor and Industries will investigate.
Reclamation Commissioner Michael L. Connor said the agency's "hearts are heavy" with this loss.
Jensen lived in Everett before moving to Idaho two years ago.
He'd worked for Reclamation as a construction inspector from 1972-80 and rejoined the agency full time in 2011.
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