The purpose of the Keystone Dam Safety Modification Study is to identify plans to reduce risk of overtopping or failure in the event of an unprecedented flood.
The accompanying Environmental Assessment has been prepared by the U.S. Army Corps of Engineers, Tulsa District to evaluate the Keystone Dam Safety Modification Study.
This EA is an assessment of potential impacts that may result from the implementation of the final array of alternatives in comparison with the No Action Alternative.
The recommended proposals would not change the normal pool elevation or the flood pool elevation. Keystone Dam will operate according to the water manual. The top of the conservation pool would remain at 723 mean sea elevation and the top of the flood pool would remain at 754 mean sea elevation.
The recommendation to raise the elevation of the dam by approximately 11 feet would not change normal operation of Keystone Dam. The emergency storage gained from increasing the height of the dam would only be used in the event the gates are completely open and the lake continues to rise.