1965: 20.77 feet

2001: 20.07

1969: 19.44

1997: 18.30

1952: 17.93

1951: 17.36

2019: 17.30

1967: 16.92

1880: 16.87

1975: 16.60

2011: 16.58

1993: 16.53

Earlier: Navigation blocked by flood waters at Alma