Historic Crests
(1) 513.30 ft on 07/13/1957
(2) 513.25 ft on 05/18/2020
(3) 513.12 ft on 07/18/1996
(4) 512.32 ft on 12/04/1982
(5) 512.25 ft on 09/14/2008
(6) 511.90 ft on 10/11/1954
(7) 511.30 ft on 08/24/2007
(8) 511.28 ft on 02/21/1997
(9) 511.10 ft on 02/21/2018
(10) 510.57 ft on 05/01/2019
(11) 509.47 ft on 05/01/2017

(P): Preliminary values subject to further review.