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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 May 2, 2008
(includes data summary)
Weather conditions: A large storm system made its way into the Great Lakes basin early this past week and brought cooler temperatures and rain along with it. Mid-week, overnight temperatures dipped to the freezing mark in many areas across the basin as high pressure and dry weather settled in. Looking ahead, a slow moving low pressure system is on its way to the basin and is expected to bring about an inch of rain to the region this weekend and early next week. Drier conditions and seasonal temperatures will return as this system moves out of the area. Lake Level Conditions: Lakes Ontario and Superior are presently 9 and 10 inches higher than they were at this time last year, respectively. Lakes Michigan-Huron and Erie are 1 inch lower than last year's level while Lake St. Clair is 3 inches lower than last year's level. Lakes Michigan Huron and Superior are predicted to rise 3 and 4 inches over the next month, respectively. Lakes Erie and Ontario are predicted to fall two inches, while Lake St. Clair is projected to stay the same over the next 30 days. Lakes Superior and Ontario are forecasted to stay above last year's water levels through October, while the remaining lakes are forecasted to remain at or below their levels of a year ago over the next several months. See the USACE Daily Levels web page for more water level information. Current outflows / channel conditions: Outflows from the St. Marys, St. Clair and Detroit Rivers are expected to be below average for May while outflows from the Niagara and St. Lawrence Rivers are forecasted to be above average. Alerts: Lake Superior is currently below chart datum, but is forecasted to go above chart datum in June. Lake Michigan Huron is currently at chart datum and is expected to rise and remain a few inches above datum through October. 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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