Repairs at Wanapum Dam will continue through the winter as workers anchor the spillway to bedrock.
The Grant County Public Utility District says 11 of 35 anchors were installed as of last week, but it can't say yet when the reservoir will be raised.
The water was lowered nearly 30 feet after a 65-foot crack was discovered in February in the spillway, the result of a construction error when the dam was built in the 1960s.
The Wenatchee World reports the utility had hoped to raise the reservoir by December. The drawdown has reduced power production at the Wanapum Dam and the upriver Rock Island Dam, near Wenatchee in central Washington.