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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 October 10, 2008
(includes data summary)
Weather conditions: Temperatures were unseasonably cool throughout the much of the Great Lakes region early in the week, but began to warm up on Tuesday and Wednesday. In addition, the vast majority of the region experienced rain on Tuesday and Wednesday as well. The warming trend will continue into the weekend, as temperatures are expected to be about 8 to 10 degrees above average over most of the basin. There is a good chance rain may appear in the far western portion of the Lake Superior and Lake Michigan-Huron basins, otherwise it will be dry over the weekend. Water Level Conditions: Currently, every one of the Great Lakes are above their levels of a year ago, ranging from 2 to 8 inches higher than what they were at this time last year. All of the Great Lakes are in their periods of seasonal decline and are predicted to drop over the next 30 days. Lakes Superior and Michigan-Huron are predicted to drop 1 to 2 inches, while Lakes St. Clair, Erie, and Ontario are projected to drop 4 to 6 inches. Lakes Superior, Michigan-Huron, St. Clair, and Ontario are forecasted to remain above their levels of a year ago over the next several months, while Lake Erie is projected to remain at around last year's level. See the USACE Daily Levels web page for more water level information. Current outflows / channel conditions: In September, the outflows through the St. Mary's, St. Clair, Detroit, and Niagara Rivers were below average while the outflow from 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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