FEBRUARY 2018 BEACON

15 DEC

2016

2017

2018

Ft.

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

M.

1985

1985

1985

1985

1952

1985

1952

1985

1950

1950

1985

1985

1985

1986

1986

+ 2

+ 0.6

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

+1

+ 0.3

US Army Corps of Engineers Detroit District

0

0

1925

CHART DATUM 601.1 FEET (183.2 METERS)

2007

2007

1925

1926

1925

1925

LAKE SUPERIOR

1926

-1

-0.3

1926

1926

1926

1926

1926

1926

1926

1926

1926

1926

MONTHLY BULLETIN OF LAKE LEVELS FOR THE GREAT LAKES

15 DEC

2016

2017

2018

Ft.

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

M.

DECEMBER 2017

1986

1986

+ 5

+ 1.5

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

Water levels for the previous year and the current year to date are shown as a solid line on the hydrographs. A projection for the next six months is given as a dashed line. This projection is based on the present condition of the lake basin and anticipated future weather. The shaded area shows a range of possible levels over the next six months dependent upon weather variations. Current and projected levels (solid and dashed lines) can be compared with the 1918-2016 average levels (dotted line) and extreme levels (shown as bars with their year of occurrence). The legend below further identifies the information on the hydrographs.

1986

1986

1986

1986

1986

1986

1986

1986

1986

1987

1987

1987

+ 4

+ 1.2

1986

1986

1986

1986

1986

1986

+ 3

+ 0.9

+ 2

+ 0.6

+1

+ 0.3

0

0

CHART DATUM 577.5 FEET (176.0 METERS)

1964

1964

1964

1964

1964

1964

LAKES MICHIGAN-HURON

1964

1964

-1

-0.3

2012

1964

2012

1964

1964

1964

1964

1964

2013

2013

LEGEND

15 DEC

2016

2017

2018

Ft.

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

M.

LAKE LEVELS

1986

1986

1986

1986

1986

1986

1986

1986

+ 5

+ 1.5

RECORDED

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

PROJECTED

+ 4

+ 1.2

+ 3

+ 0.9

AVERAGE **

1985

+ 2

+ 0.6

MAXIMUM **

1985

1973

1973

1934

MINIMUM **

1936

1934

+1

+ 0.3

1926

1934

1934

1934

1934

1934

0

0

1934

1926

1926

CHART DATUM 572.3 FEET (174.4 METERS)

1934

1964

1964

1934

The levels on the hydrographs are shown in both feet and meters above (+) or below (-) Chart Datum. Chart Datum, also known as Low Water Datum, is a reference plane on each lake to which water depth and Federal navigation improvement depths on navigation charts are referred. Ԁ All elevations and plots shown in this bulletin are referenced to International Great Lakes Datum 1985 (IGLD 1985). IGLD 1985 has its zero base at Rimouski, Quebec near the mouth of the St. Lawrence River (approximate sea level).

LAKE ST. CLAIR

1934

1934

-1

-0.3

1926

1926

1936

1936

15 DEC

2016

2017

2018

Ft.

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

M.

+ 6

+ 1.8

1986

1986

1986

1986

1985

1985

1985

+ 5

+ 1.5

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1986

1987

1987

1987

1986

1986

1986

1986

1987

1987

1987

+ 4

+ 1.2

+ 3

+ 0.9

NOVEMBER MEAN LAKE LEVELS

+ 2

+ 0.6

ELEVATIONS REFERENCED TO THE CHART DATUM OF EACH RESPECTIVE LAKE (IGLD 1985)

+1

+ 0.3

Superior

Mich- Huron

St. Clair

Erie

Ontario

0

1934

1934

0

1934

1934

1934

CHART DATUM 569.2 FEET (173.5 METERS)

1934

1934

1934

* 2017

Ft.

602.95

580.22

575.59

572.38

245.60

1934

LAKE ERIE

1935

1935

1934

1934

1934

1934

1934

1936

1936

M.

183.78

176.85

175.44

174.46

74.86

-1

-0.3

2016

Ft.

602.33

579.36

574.77

571.72

244.36

M.

183.59

176.59

175.19

174.26

74.48

Ft.

603.31

581.96

576.84

573.65

246.65

15 DEC

2016

2017

2018

Ft.

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

M.

** MAX.

M.

183.89

177.38

175.82

174.85

75.18

1952

1952

Yr.

1985

1986

1986

1986

1945

1973

1973

1973

+ 5

+ 1.5

1947

1947

1973

1973

1973

1947

1947

Ft.

600.43

576.28

571.46

568.24

241.96

1947

1947

1952

1952

1952

+ 4

+ 1.2

** MIN.

M.

183.01

175.65

174.18

173.20

73.75

1952

1952

1952

1945

1945

1945

1945

1945

1945

1945

1946

1946

1946

Yr.

1925

1964

1934

1934

1934

+ 3

+ 0.9

** AVG.

Ft.

601.94

578.67

573.85

570.87

244.52

+ 2

+ 0.6

M.

183.47

176.38

174.91

174.00

74.53

* provisional ** Average, Maximum and Minimum for period 1918-2016

+1

+ 0.3

1935

0

0

1934

1935

1935

CHART DATUM 243.3 FEET (74.2 METERS)

1935

1935

1934

1935

1935

LAKE ONTARIO

1934

-1

-0.3

1934

1935

1935

1936

1936

1934

1934

1934

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