Historic Crests
(1) 570.25 ft on 05/29/1957
(2) 564.89 ft on 05/09/1990
(3) 561.45 ft on 12/28/1991
(4) 561.35 ft on 06/08/2016
(5) 556.88 ft on 07/05/2007
(6) 556.19 ft on 06/04/2015

(P): Preliminary values subject to further review.