WANAPUM DAM, Wash. (AP) -- The Grant County Public Utility District is exploring the possibility of using steel anchors to repair its cracked Wanapum Dam on the Columbia River.
The steel strand anchors would be drilled from the top of the dam through the concrete structure into bedrock, and would be set into place with a specialized grout.
The utility is working with federal regulators and an independent board in deciding how to repair the dam.
The 50-year-old dam is located six miles south of Vantage and the Interstate 90 bridge in central Washington.
A crack was discovered on a spillway pier in late February that was about 65 feet long and about 2 inches wide.
Officials do not know what caused the crack, but say the dam is not in danger of failing.
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