Corps taking extra precaution at lake

By REGGIE ROSS
Staff Writer

 

The U.S. Army Corps of Engineers (USACE) Vicksburg District (MVK) is taking precautionary flood fight measures at the Grenada Lake Dam due to forecasted rainfall in the region.
District engineers began making preparations to place stone in the emergency spillway, and the work began Friday. The stone will be placed over gabion baskets that are currently in the bottom of the channel to further armor the channel in advance of additional rainfall forecast in the upcoming weeks.
“We’ve used some of our rocks, but there’s a special order that’s been made approximately of about 6,000 tons that are expected to be here by Wednesday,” said Chris Terry, natural resource manager at Grenada Lake.
The reservoir at Grenada Lake Dam is currently at an elevation of 225.6 feet, and the project’s emergency spillway is at an elevation of 231 feet. Based on current water on the ground and the National Weather Service’s precipitation forecasts, Grenada Lake’s elevation has the potential to come within a few feet of the crest within the next few weeks.
Grenada is one of four flood control reservoirs in Mississippi maintained and operated by MVK. The district’s four Mississippi flood control reservoirs – Enid, Grenada, Sardis and Arkabutla lakes – are used to hold runoff, or excess rainwater, as a flood-prevention measure.
MVK used these four flood control reservoirs to reduce the peak flow of rainfall runoff by approximately 90 percent during the unprecedented rainfall event throughout the region in February. During the rain event, the reservoirs each held an average of nine inches of rainfall runoff, which generated an estimated 320,000 cubic feet per second of combined inflow into the reservoirs.
The district will continue to monitor water elevations throughout the region and will issue an update if a change in forecast indicates that spillway flow at Grenada is imminent.

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