After 60 years, the design flood for the Bluestone dam changed requiring a modest raise and a number of other improvements totaling some $130 million thus far and another estimated $200 million in improvements still to go. Check out the size of these anchors being use to anchor the dam foundation into bedrock. This is just one of 150 anchors. The article also discussed how the rock strength parameters used to design the dam 60 years ago were developed using the state of the practice at the time, new rock strength parameters are lower using current design standards. [Source: The Charleston Gazette. Image: Charleston Gazette]
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Mill Creek Dam near Walla Walla, WA Leaking, Receives Corps Worst Rating
November 7, 2008
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Failures
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The Mill Creek Dam near Walla Walla, Washington has served its purpose admirably for over 67 years but according to a recent report by the US Army Corps of Engineers, the dam received a Dam Safety Action Category (DSAC) rating of 1 out of 5 which means that the risk to public safety is too great when Bennington lake which is formed by the dam is more than 17% full for an extended period of time. More after the break. (Photo by USACOE)