Historic Crests
(1) 527.30 ft on 05/04/2011
(2) 521.60 ft on 02/24/1989
(3) 521.20 ft on 05/22/1983
(4) 520.90 ft on 09/28/1979
(5) 517.90 ft on 03/22/1997
(6) 517.10 ft on 12/28/2007
(7) 516.70 ft on 05/12/1984
(8) 516.30 ft on 04/01/1975
(9) 515.50 ft on 01/01/2008
(10) 515.20 ft on 05/23/1995
(11) 514.40 ft on 06/05/2004
(12) 514.10 ft on 05/01/1967
(13) 512.20 ft on 01/12/1991
(14) 511.90 ft on 04/23/2015
(15) 510.80 ft on 05/09/2010
(16) 509.30 ft on 05/18/2003
(17) 507.60 ft on 02/20/1990
(18) 506.20 ft on 05/03/2002
(19) 505.30 ft on 05/23/2016
(20) 504.20 ft on 09/27/2006
(21) 503.90 ft on 05/12/2009

(P): Preliminary values subject to further review.