JANUARY 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. Ô 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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