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April 10, 2014
SPOKANE — Pressure from the water behind Wanapum Dam may have contributed to the big crack that has disrupted operations at the structure, the Grant County Public Utility District said Wednesday.
The cause of the crack remains unknown, but the utility said it had ruled out four possibilities: seismic activity, foundation settlement, operation of spillway gates and explosions at the nearby Yakima Training Center operated by the U.S. Army.
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