Historic Crests
(1) 559.70 ft on 05/07/2011
(2) 549.90 ft on 05/23/1983
(3) 545.70 ft on 03/13/1989
(4) 544.70 ft on 03/22/1997
(5) 542.70 ft on 05/14/1984
(6) 541.60 ft on 01/19/1985
(7) 541.20 ft on 04/01/1979
(8) 539.90 ft on 05/02/1995
(9) 538.60 ft on 04/01/1972
(10) 536.30 ft on 04/01/1975
(11) 535.90 ft on 12/01/1978
(12) 532.70 ft on 01/13/1991
(13) 532.00 ft on 05/10/2010

(P): Preliminary values subject to further review.