Two dams breached in Midland County, Michigan, causing flooding and the evacuation of 10,000 local residents after days of heavy rains. The Edenville Dam and the Sanford Dam both experienced “catastrophic dam failures” affecting the City of Midland about 8 miles downstream of the Sanford Dam. A Dow Chemical plan sits on the City’s riverbank as well. So far no injuries are reported, but there are many challenges associated with opening shelters in the midst of a pandemic. The governor of Michigan urged people to stay with friends or relatives or to go to one of the shelters. The Edenville Dam was built in 1924 and was rated in unsatisfactory condition in 2018 by the state.
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)
LANCASTER — Months of explosive blasting are expected to begin at the site of Center Hill Dam next week as the U.S. Army Corps of Engineers prepares to begin construction work at the aging dam in Lancaster.
"The blasting will be to excavate a platform for construction, about 40 feet wide and will look similar to a road cut through a hill," [Corps Project Manager Linda Adcock] said. "Just the nature of how we grout, and moving equipment back and forth on the current slopes, which are as much as 40 percent and greater, is just really difficult. So for these reasons, for safety, quality, the accuracy and the consistency of the drill holes are much better done from a platform, they proposed this road cut type of a platform."
The drilling is for grouting remediation of the dam foundation. Story from Herald-Citizen, Cookeville, Tennessee.