Water flows over the Medina Lake spillway May 31, 2016 as seen in an aerial image taken with a remote control quadcopter. On May 31, 2015 the lake was 51.5 percent full according to data from the Texas Water Development Board. Instantaneous water readings as of 6 p.m. Tuesday show the lake to be .9 feet into flood stage and that it has been rising for the last 48 hours.