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Title: Final Environmental Assessment : Upper and Lower Legion Lakes Repairs, Fort Jackson, South Carolina
Authors: United States. Army. Corps of Engineers. Charleston District
Keywords: Fort Jackson (S.C.)
Flood control
Environmental protection
Environmental management
Publisher: United States. Army. Corps of Engineers. Charleston District.
Abstract: The US Army Training Center and Fort Jackson is centrally located within the State of South Carolina in Richland County. The fort includes more than 52,000 acres, with more than 100 ranges and field training sites and 1,160 buildings. Soldiers, civilians, retirees and family members make up the Fort Jackson community. More than 3,500 active duty Soldiers and their 12,000 family members are assigned to the installation and make this area their home. Upper and Lower Legion Lakes are all located off Semmes Road. The Lakes are located completely within the boundaries of Fort Jackson’s Military Reservation, and as such, are owned by the Federal Government. Both Upper and Lower Legion Lakes are located on a tributary of Wildcat Creek. Upper Legion Dam separates Upper Legion Lake from Lower Legion Lake. During a four day period from October 2-5, 2015 a stalled mid-latitude weather system directed a stream of deep tropical moisture across South Carolina resulting in record-breaking rainfall totals across the state. The 4-day rainfall totals in the Columbia area exceeded the 1,000-year recurrence intervals as referenced to the point precipitation frequency estimates in NOAA Atlas 14. Total rainfall exceeded 20 inches across much of eastern South Carolina. Upper Legion Dam overtopped, suffered damage, but did not breach during the October 2015 storm event. Emergency/temporary repairs made included, plugging 2 of the 3 spillways with concrete, and buttressing the downstream slope of the dam. Lower Legion Dike overtopped and breached. A breach 50 feet wide and over 12 feet in height was created draining Lower Legion Lake. A temporary repair (the spillway was replaced and the embankment in the breach area was repaired) was made to the Lower Legion Dike so that water could be provided to the Fort Jackson Golf course pump station, which is located on the lake. The purpose of this EA is to analyze and evaluate the environmental impacts of alternatives and to analyze and evaluate the environmental impacts of alternatives to update Upper Legion Dam and Lower Legion Dike to current dam safety standards.
Description: Environmental Assessment and Finding of No Significant Impact
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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