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.
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From ENR:
The San Diego County Water Authority board of directors last week certified the environmental impact report to raise San Vicente Dam by 117 ft.
The $568-million project, to be built on top of the existing San Vicente Dam in Lakeside, will expand the reservoir to hold an additional 52,000 acre-ft of water for use during emergencies and another 100,000 acre-ft of water to supplement imported supplies during dry periods.
The Dam will be constructed of roller compacted concrete and will reportedly be the largest dam raising ever performed in the US and the largest using roller compacted concrete in the world. (Photo by O’Connor Construction Management, Inc.)