We saw how the release of flood water from dams on the Kansas River damaged the spillways on Tuttle Creek and Milford reservoirs in 1993.
The damage at Milford was so great at Milford that it raised concern with the U.S. Army Corps of Engineers (USACE) about the possible integrity of the dam itself I recall.
According to this story from the BISMARCK TRIBUNE- release of water through the Garrison spillway from the swollen Lake Sakakawea has caused a "pothole" in the dam's concrete spillway.
The Corps shut the spillway gates- then re-opened them "slowly" to observe if the releases would further damage the spillway.
The TRIBUNE says that the USACE has a contractor "standing by" to make emergency repairs to the spillway if needed.
Current forecasts call for the Missouri River to reach a flood stage of 40-feet in Kansas City later this month.
Flood stage here is 32 feet- and the record stage- set in 1993- is nearly 49 feet.