Felsenthal Lock and Dam, located in Union, Arkansas, is a gravity dam constructed by the US Army Corps of Engineers in 1978 for the primary purpose of navigation on the Ouachita River.
Wind
Humidity
With a structural height of 105 feet and a hydraulic height of 36 feet, the dam spans 659 feet in length and has a storage capacity of 76,700 acre-feet. The dam also serves purposes of recreation and water supply, covering a surface area of 22,730 acres and draining a watershed area of 10,782 square miles.
With a controlled spillway and one lock measuring 600 feet in length and 84 feet in width, Felsenthal Lock and Dam poses a significant hazard potential due to its very high risk assessment for flooding. The US Army Corps of Engineers actively manages dam-related flood risks by monitoring the dam's condition, prioritizing risk-reducing activities, and engaging with emergency managers and the public to raise awareness and preparedness for potential emergencies. Regular maintenance and updates to the emergency action plan are key components of the risk management measures implemented by the USACE to ensure the safety and integrity of Felsenthal Lock and Dam.
Year Completed |
1978 |
Dam Length |
659 |
River Or Stream |
OUACHITA |
Primary Dam Type |
Gravity |
Surface Area |
22730 |
Length Of Locks |
600 |
Hydraulic Height |
36 |
Drainage Area |
10782 |
Nid Storage |
76700 |
Structural Height |
105 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
105 |
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132cfs |
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358cfs |
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380cfs |
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3190cfs |
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109cfs |