Lake is currently at 555.72 and spillway is 560. I went back and these are the only 4 times I can find in Grapevine Lake history where it went over the spillway. Anyone remember?
Appears the dates it went over were...
June 5th, 1957 - 560.80 max
October 31st, 1981 - 563.29 max
June 13th, 1989 - 562.32 max
May 3rd, 1990 - 562.96 max