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Connecting Channels Forecasts
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Great Lakes, Connecting Channels & St. Lawrence River Water Levels and Depths
The expected water levels on the Great Lakes, Connecting Channels and the St. Lawrence River, as well as the period-of-record average levels for the Great Lakes, are given in inches above (+) or below (-) Low Water Datum (LWD). LWD also known as Chart Datum is a plane of reference used on a navigation chart. The LWD elevations shown below are given on International Great Lakes Datum, 1985 (IGLD1985).
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Great Lakes |
Period of Record Average Levels (1900-2008) |
Expected Levels |
Period of Record Average Levels (1900-2008) |
Expected Levels |
Low Water Datum |
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November 20 |
November 20, 2009 |
December 5 |
December 5, 2009 |
IGLD 1985 |
| Lake Ontario |
+ 15 |
+ 10 |
+ 15 |
+ 10 |
243.3 |
| Lake Erie |
+ 18 |
+ 22 |
+ 18 |
+ 22 |
569.2 |
| Lake St. Clair |
+ 18 |
+ 20 |
+ 17 |
+ 20 |
572.3 |
| Lakes Michigan/Huron |
+ 15 |
+ 10 |
+ 14 |
+ 9 |
577.5 |
| Lake Superior |
+ 10 |
+ 5 |
+ 9 |
+ 4 |
601.1 |
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St. Lawrence River |
Expected Level
November 20 |
Expected Level
December 5 |
Low Water Datum
IGLD 1985 |
| Above Long Sault Dam |
+ 20 |
+ 22 |
237.9 |
| Above Iroquois Dam |
+ 9 |
+ 10 |
240.3 |
| Ogdensburg |
+ 10 |
+ 10 |
242.4 |
| Alexandria Bay |
+ 11 |
+ 11 |
243.0 |
| Head of River at Cape Vincent |
+ 10 |
+ 10 |
243.3 |
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Detroit River |
Expected Level
November 20 |
Expected Level
December 5 |
Low Water Datum
IGLD 1985 |
| Lake Erie at Pelee Passage |
+ 22 |
+ 22 |
569.2 |
| Mouth of River at Gibraltar |
+ 21 |
+ 21 |
569.5 |
| Head of River above Belle Isle |
+ 20 |
+ 20 |
572.0 |
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St. Clair River |
Expected Level
November 20 |
Expected Level
December 5 |
Low Water Datum
IGLD 1985 |
| Mouth of River at St. Clair Flats |
+ 20 |
+ 20 |
572.3 |
| Algonac |
+ 20 |
+ 19 |
572.8 |
| St. Clair |
+ 16 |
+ 15 |
574.4 |
| Blue Water Bridge |
+ 13 |
+ 12 |
576.7 |
| Head of River at Fort Gratiot |
+ 10 |
+ 9 |
577.2 |
| Lake Huron Approach Channel |
+ 10 |
+ 9 |
577.2 |
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St. Marys River |
Expected Level
November 20 |
Expected Level
December 5 |
Low Water Datum
IGLD 1985 |
| Mouth of River at Detour |
+ 10 |
+ 9 |
577.5 |
| West & Middle Neebish |
+ 11 |
+ 9 |
577.6 |
| Head of Little Rapids |
+ 7 |
+ 5 |
578.4 |
| Below Locks |
+ 5 |
+ 3 |
578.7 |
| Above Locks |
+ 8 |
+ 7 |
600.4 |
| Head of River at Point Iroquois |
+ 5 |
+ 4 |
601.1 |
Available water depth is determined for a location by adding (if +) or subtracting (if -) the amount from the above table to the channel depth shown in the Connecting Channel Depths graphic or to the water depths shown on National Oceanic and Atmospheric Administration navigational charts.
CAUTION: Depths so determined are representative of a still water surface elevation, disturbed by neither wind nor other causes. Depths, however, may be reduced or increased as much as several feet for short periods of time due to these disturbances, or when sections of channels develop shoals. Vessel masters should refer to "Local Notice to Mariners" for extent of shoaling and scattered bedrock projections in all channels.
Return to the Levels home page.
Return to the Detroit District Home Page.
The Detroit District US Army Corps of Engineers is a Great Lakes Information Partner
Last update: 11-16-2009
For comments or questions please email hhpm@usace.army.mil
or call 1-888-694-8313 and select option one
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In order to make the Data & Reports available as soon as possible, unedited real time data is used.
Please read the Disclaimer before proceeding.
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