Workers drill at Wanapum Dam to learn more information about a crack in the structure.
May 13, 2014
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May 13, 2014 1:30 p.m.
Investigation identifies likely cause of Wanapum Dam fracture
BEVERLY, Wash.— Preliminary results of an extensive 11-week investigation by Grant PUD and its consultants has determined that the primary contributing factor to a fracture developing within the dam's spillway, was a mathematical error during the pre-construction design of Wanapum Dam.