The U.S. Army Corps of Engineers releases the largest amount of water to run through Keystone Dam in 21 years after torrential downpours soaked the Arkansas River drainage basin in northeastern Oklahoma.
On Monday, the corps released 100,000 cubic feet of water per second from the dam, which is located about 24 miles northwest of Tulsa. The rate's equivalent to an Olympic-sized swimming pool flowing into the Arkansas River every second.
Volunteers filled over 4,000 sand bags on Saturday to help prevent flooding.
Storms dumped up to 9 inches of rain in parts of Kansas and Oklahoma last week, with some runoff in the Arkansas River basin ending up in Keystone Lake, popular for boating and fishing and camping.