Keystone Lake Project Office, park rangers, Alex Bilinski, left, and Lauren Enloe, right, U.S. Army Corps of Engineers, Tulsa District, take and record piezometer readings during daily flood watch at Keystone Dam, in Sand Springs, Okla., July 11, 2025. When Keystone Lake rises to elevation 737, park rangers and lake office staff transition to daily flood watch which requires increased data gathering. Piezometers are used to measure groundwater pressure below dams. Photo by Brannen Parrish, USACE
