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Great Lakes Levels and Hydrology
Lake Superior | St. Marys River | Lake Michigan | Lake Huron | St. Clair River Lake St. Clair | Detroit River | Lake Erie | Niagara River | Lake Ontario | St. Lawrence
Weekly Forecast 
Update for Friday June 20, 2008
(includes data summary)
Weather conditions: A large upper level low pressure sitting over Quebec meant cool and cloudy conditions across the Great Lakes basin this week. Light showers were reported also as several smaller disturbances rotated around the upper low. All of the Great Lakes have seen above average precipitation to date in June. The weekend looks to remain cool as another upper level low settles over the region. Scattered showers are possible through Sunday. Lake Level Conditions: All of the Great Lakes are higher than they were at this time last year. Lakes Superior and Michigan-Huron are 14 and 4 inches higher, respectively. Lakes St. Clair and Erie are 3 inches above last year's levels, while Lake Ontario is 8 inches higher. Lakes Superior and Michigan-Huron are projected to rise 3 and 2 inches, respectively, over the next month. Lakes St. Clair, Erie and Ontario are forecasted to fall 2 to 4 inches during the next 30 days. Lakes Superior and Michigan-Huron are predicted to stay above last year's water levels through November. Lakes St. Clair and Erie will remain near last year's levels over the next several months, while Lake Ontario is predicted to remain higher than last year's level. See the USACE Daily Levels web page for more water level information. Current outflows / channel conditions: Outflows from the St. Mary's, St. Clair, and Detroit Rivers were below average for May. The outflows through the Niagara and St. Lawrence Rivers were above average. Alerts: Users of the Great Lakes, connecting channels and St. Lawrence River should keep informed of current conditions before undertaking any activities that could be affected by changing water levels. Mariners should utilize navigation charts and refer to current water level readings.
Related Resources GLIN: Agencies and Organizations, Hydrology GLIN: Current Great Lakes-St. Lawrence Water Levels GLIN: Environmental Research in the Great Lakes Region GLIN: Forecasted Great Lakes-St. Lawrence Water Levels GLIN: Great Lakes-St. Lawrence Hydrology GLIN: Great Lakes-St. Lawrence Water Flows GLIN: Historical Great Lakes-St. Lawrence Water Levels GLIN: Weather and Climate in the Great Lakes Region
This page was created under the guidance of the binational Coordinating Committee on Great Lakes Basic Hydraulic and Hydrologic Data. This symbol is used throughout the GLIN hydrology section to indicate data or references prepared under the auspices of the Coordinating Committee.
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