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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 Water Levels Forecast 
Update for Friday July 3, 2009
(includes data summary)
Weather conditions: Cloudy, cool and rainy conditions were experienced across much of the Great Lakes basin this week. Temperatures barely reached 60 degrees in some locations on Monday, Tuesday and Wednesday. Light rain and a few heavier showers were also reported throughout the week. The upcoming holiday weekend looks very nice, with more seasonable temperatures and increasing sunshine. Water Level Conditions: Lake Superior is 1 inch below the level it was a year ago while Lakes Michigan-Huron, St. Clair, and Erie are 10, 5, and 4 inches, respectively, higher than their levels of a year ago. Lake Ontario is at the same level it was a year ago. Lake Superior is expected to rise 2 inches over the next month, while Lake Michigan-Huron is predicted to remain steady. Lakes St. Clair, Erie and Ontario are predicted to decline 3 to 5 inches over the next 30 days. Over the next several months, Lake Superior is predicted to be near its level of a year ago. Lakes Michigan-Huron, St. Clair, and Erie are forecasted to remain at or above last year's levels. Lake Ontario is forecasted to be at or below its levels of a year ago over the next six months. See the USACE Daily Levels web page for more water level information. Current outflows / channel conditions: In June, the outflow from Lake Superior through the St. Mary's River was near average, while the outflow from Lake Michigan-Huron through the St. Clair River was below average. The Detroit and Niagara Rivers carried near average flows during June. The outflow from Lake Ontario through the St. Lawrence River was 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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