Historic Crests
(1) 592.23 ft on 03/31/1951
(2) 591.38 ft on 04/03/2005
(3) 590.90 ft on 04/05/1987
(4) 590.58 ft on 08/29/2011
(5) 589.92 ft on 04/17/2007
(6) 589.56 ft on 09/08/2011
(7) 589.54 ft on 11/09/1977
(8) 589.39 ft on 03/23/2010
(9) 589.05 ft on 09/19/2004
(10) 588.84 ft on 05/11/1998
(11) 588.80 ft on 12/03/1996
(12) 588.65 ft on 04/18/1993
(13) 588.32 ft on 04/17/1996
(14) 588.12 ft on 04/17/1994
(15) 588.11 ft on 03/05/1991
(16) 588.03 ft on 05/12/1990
(17) 587.20 ft on 04/25/1995
(18) 586.22 ft on 06/12/1992

(P): Preliminary values subject to further review.