like us on Facebookfollow us on Twitter
News Calendar Great Links Site of the Month E-mail Lists Information Center About GLIN Search
The Great Lakes Environment Economy Education Maps and GIS Tourism
Tourism Maps and GIS Education Economy Environment Great Lakes
About the photos (©Mahan, except for satellite photo)

Environment Topics

Air and Land
Air Quality
Coastal Management
Ecosystem Management
Land Use
Sustainable Development

Levels and Hydrology
Quantity and Use
Rivers and Lakes

Flora and Fauna
Endangered Species
Invasive Species
Invasive Mapping

Air Toxics
Areas of Concern
Human Health
Pollution Prevention
Soil Erosion
Toxic Contamination

Agencies & Organizations
Environmental Justice
Laws and Policy
Sanctuaries and Reserves
Weather and Climate

Legislative Tracking
Great Lakes Priorities
Legislative News

Lake Conditions

Lake Erie
Lake Huron
Lake Michigan
Lake Ontario
Lake Superior
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
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
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.

Lake Michigan water level on rise after years of decline
Chicago Tribune (7/7)
Although Lake Michigan and Lake Huron water levels are not projected to hit any record highs in the coming months, scientists predict that they could approach or exceed their historical long-term averages for the first time in more than a decade.

Search GLIN for more news items about    
Back to Top
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

Back to Top

Weekly Water Levels Forecast
New! Update for Friday July 11, 2014 (includes data summary)

Weather conditions: The wet summer has continued into July with nearly one inch of rain falling across the entire Great Lakes basin this past week. Seasonally average temperatures accompanied the moisture. The weather roller coaster is expected to continue through the weekend as rain is anticipated across the entire basin. Temperatures are forecasted to remain near their seasonal normal through the weekend and to start the new week. There remains a chance for precipitation as the new week continues.

Water Level Conditions: Lakes Superior and Michigan-Huron are 13 and 14 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 4 and 3 inches, respectively, above what they were at this time last year, while Lake Ontario is 2 inches below its level of a year ago. Lakes Superior and Michigan-Huron are both expected to rise an inch over the next month. Lake St. Clair is predicted to drop 2 inches from its current level over the next thirty days, while Lakes Erie and Ontario are projected to fall 3 and 6 inches, respectively. 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 is 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. Ice information can be found at the National Ice Center's webpage.

Back to Top

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

Back to Top

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.


News | Calendar | Great Links | SOTM | E-Lists | Info Center | About GLIN
The Great Lakes | Environment | Economy | Education | Maps and GIS | Tourism

Follow us on Facebook and Twitter.

Visit us at labs.glin.net
Great Lakes Information Network
Updated: July 22, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
Contact Us | Search | Site Index
© 1993-2012