Historic Crests
(1) 589.80 ft on 04/01/1886
(2) 583.20 ft on 01/22/1947
(3) 583.10 ft on 12/30/1932
(4) 582.90 ft on 04/08/1936
(5) 582.80 ft on 02/12/1946
(6) 582.75 ft on 11/30/1948
(7) 582.20 ft on 04/10/1938
(8) 582.00 ft on 07/12/1996
(9) 582.00 ft on 03/18/1990
(10) 581.70 ft on 12/31/1901
(11) 581.20 ft on 12/12/1919
(12) 581.20 ft on 03/15/1909
(13) 580.90 ft on 03/05/1979
(14) 580.90 ft on 01/04/1937
(15) 580.70 ft on 02/12/1921
(16) 578.90 ft on 02/24/2019
(17) 578.50 ft on 03/27/1964
(18) 578.50 ft on 12/31/2015
(19) 576.80 ft on 02/14/2020
(20) 576.80 ft on 12/19/1961
(21) 576.10 ft on 05/09/2003
(22) 575.60 ft on 05/01/1963
(23) 574.70 ft on 01/08/2009
(24) 574.10 ft on 11/13/2009
(25) 574.00 ft on 11/16/2018
(26) 574.00 ft on 03/26/2020
(27) 573.90 ft on 04/09/2014
(28) 573.80 ft on 05/10/2013
(29) 573.70 ft on 12/11/2018
(30) 573.40 ft on 04/15/2020
(31) 573.20 ft on 03/07/2020
(32) 573.10 ft on 05/22/2013
(33) 573.00 ft on 01/26/2010
(34) 572.80 ft on 02/07/2010
(35) 572.50 ft on 01/06/2019
(36) 572.30 ft on 03/17/2019
(37) 572.20 ft on 10/13/2009
(38) 572.10 ft on 07/12/2013
(39) 572.00 ft on 05/01/2013
(40) 572.00 ft on 01/21/2013
(41) 572.00 ft on 01/01/2019
(42) 571.90 ft on 02/21/2010
(43) 571.70 ft on 01/06/2015
(44) 571.00 ft on 12/20/2009
(45) 570.90 ft on 12/05/2015
(46) 570.50 ft on 04/21/2019
(47) 570.40 ft on 12/11/2009
(48) 570.20 ft on 12/24/2019

(P): Preliminary values subject to further review.