Historic Crests
(1) 558.15 ft on 06/29/1957
(2) 556.95 ft on 05/19/1943
(3) 556.90 ft on 05/08/1908
(4) 556.41 ft on 01/05/1950
(5) 555.48 ft on 05/27/1968
(6) 554.28 ft on 02/11/1959
(7) 554.28 ft on 04/24/1944
(8) 554.00 ft on 02/22/1951
(9) 553.90 ft on 09/30/1911
(10) 553.45 ft on 06/25/1960
(11) 553.04 ft on 06/07/1947
(12) 553.00 ft on 12/10/1966
(13) 553.00 ft on 07/11/1942
(14) 552.93 ft on 03/22/1962
(15) 552.90 ft on 04/04/1945
(16) 552.85 ft on 04/24/1964
(17) 552.42 ft on 08/02/1958
(18) 552.31 ft on 05/12/1961
(19) 552.20 ft on 01/31/1969
(20) 551.90 ft on 04/14/1909
(21) 551.86 ft on 03/28/1948
(22) 551.56 ft on 02/16/1949
(23) 550.50 ft on 03/21/1912
(24) 549.70 ft on 01/20/1910
(25) 549.41 ft on 06/24/1952
(26) 549.13 ft on 05/20/1966
(27) 548.79 ft on 06/04/1965
(28) 548.77 ft on 03/22/1998
(29) 548.65 ft on 02/02/1994
(30) 548.60 ft on 03/08/1982
(31) 548.52 ft on 02/28/1975
(32) 548.50 ft on 04/12/1979
(33) 548.45 ft on 02/22/1976
(34) 548.43 ft on 05/18/1996
(35) 548.42 ft on 05/18/1946
(36) 548.36 ft on 12/18/1985
(37) 548.18 ft on 02/05/1991
(38) 548.02 ft on 02/01/2005
(39) 547.90 ft on 12/22/1992
(40) 547.69 ft on 02/23/1985
(41) 547.65 ft on 06/01/2002
(42) 547.15 ft on 01/10/1983
(43) 547.15 ft on 02/17/1984
(44) 547.10 ft on 04/06/1953
(45) 547.09 ft on 01/23/2016
(46) 547.03 ft on 01/05/2010
(47) 546.74 ft on 03/29/1978
(48) 546.73 ft on 03/10/1997
(49) 546.52 ft on 12/28/1987
(50) 546.46 ft on 04/24/2013
(51) 546.41 ft on 02/25/1956
(52) 545.94 ft on 02/01/2019
(53) 545.83 ft on 01/27/1999
(54) 545.64 ft on 03/09/2018 (P)
(55) 545.56 ft on 03/19/2008
(56) 545.30 ft on 04/09/2006
(57) 545.21 ft on 04/19/2019 (P)
(58) 545.12 ft on 12/31/2008
(59) 544.98 ft on 01/13/2019 (P)
(60) 544.96 ft on 03/10/1963
(61) 544.76 ft on 04/11/1980
(62) 544.68 ft on 02/28/2001
(63) 544.64 ft on 01/20/2004
(64) 544.61 ft on 02/05/1987
(65) 544.59 ft on 04/22/1955
(66) 544.42 ft on 09/02/1941
(67) 544.21 ft on 03/30/1977
(68) 544.16 ft on 02/28/1990
(69) 544.00 ft on 02/27/2014
(70) 543.54 ft on 03/05/2007
(71) 543.48 ft on 05/07/2019
(72) 543.13 ft on 01/20/1995
(73) 542.77 ft on 01/05/2015
(74) 542.74 ft on 04/16/1954
(75) 542.62 ft on 05/23/2017
(76) 542.49 ft on 12/17/1991
(77) 542.40 ft on 04/29/2018 (P)
(78) 542.15 ft on 01/29/2012
(79) 542.09 ft on 09/18/1981
(80) 542.03 ft on 01/12/1989
(81) 541.10 ft on 07/12/2003
(82) 540.81 ft on 09/29/2000
(83) 540.42 ft on 06/18/2018 (P)

(P): Preliminary values subject to further review.