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Also: Lake St. Clair
 

Great Lakes Levels and Hydrology
What's New | Current Levels | Weekly Levels Forecast | Related Resources
 
Levels & Hydrology Section: Home | Levels | Hydrology | Flows

 
What's New
Rising Lake Superior levels are a mixed blessing
The Daily Press (7/23)
A year ago, Lake Superior was a full foot below its current level, and the Lower Great Lakes were recording record lows that hadn’t been reached in over a century and a half of recording lake level data.

DRAIN
(7/16)
The Superior Watershed Partnership partnered with an independent film company to bring attention to Great Lakes water quantity and quality issues. DRAIN is a feature length documentary currently being filmed that searches for the cause of historically low Great Lakes water levels. Visit the launch page or find the film on facebook.

Binational Great Lakes Quarterly Climate Impact Report
(7/14)
Spring 2014 for the Great Lakes region was the 5th coldest since 1948. What could this mean for the summer forecast? For a binational overview of the latest season's weather, water level conditions, and related impacts, plus an outlook for the upcoming quarter, review the Quarterly Climate Impacts and Outlook: Great Lakes Region via the U.S. Drought Portal.

EDITORIAL: Lake Ontario plan would hurt Orleans
The Daily News (7/14)
A plan to return Lake Ontario to “more natural” levels stems from good intentions but fails to address unintended consequences that would hurt Orleans and other south shore counties.

Rainy spring, cold winter help buoy Great Lakes levels
Journal Sentinel (7/14)
After 16 years of bottom-scraping and dredging, boaters on the Great Lakes are experiencing something different this summer: deep water which is a result of water levels hitting above average for the first time since 1998.

Rainy spring, cold winter help buoy Great Lakes levels
Milwaukee Journal Sentinel (7/14)
After 16 years of bottom-scraping and dredging, boaters on the Great Lakes are experiencing something different this summer: deep water.

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Great Lakes Real-Time Water Level Gauging Stations

These maps were prepared in partnership with the National Oceanic & Atmospheric Administration (NOAA) and its Center for Operational Oceanographic Products and Services (CO-OPS).

NOAA Logo - Link to NOAA Website
Coordinating Committee Logo - Link to CC Website

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

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Weekly Water Levels Forecast
New! Update for Friday July 25, 2014 (includes data summary)

Weather conditions: The Great Lakes Basin experienced slightly cooler than average temperatures this past weekend. However, temperatures were moderate early in the workweek before dropping on Wednesday. The region was generally dry this past week, although significant rain fell in the Lake Superior basin on Wednesday. A rainy weekend, however, is predicted for the majority of the basin. Temperatures will hover around average this weekend, but are expected to drop to below average by Monday.

Water Level Conditions: Lakes Superior and Michigan-Huron are 11 and 15 inches, respectively, above what they were at this time last year. Lake St. Clair is 7 inches above its level of a year ago, Lake Erie is near the same level as it was a year ago, and Lake Ontario is 3 inches below its level of a year ago. Lakes Superior and Michigan-Huron are each predicted to climb an inch over the next month. Lakes St. Clair, Erie and Ontario, are forecasted to drop 1, 3, and 7 inches, respectively during the next thirty days See the Great Lakes Water Levels web page for more water level information.

Forecasted outflows / channel conditions: Lake Superior’s outflow through the St. Mary’s River is forecasted to be above average for the month of July. Lake Michigan-Huron’s outflow into the St. Clair River and Lake St. Clair’s outflow into the Detroit River are predicted to be near average in July. In addition, the outflow of Lake Erie into the Niagara River and Lake Ontario’s outflow into the St. Lawrence River are projected to be above average in July.

Alerts: Official records are based on monthly average water levels and not daily water levels. 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.

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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

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CC Data 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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Updated: July 30, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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