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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
St. Lawrence water levels linked to invasives
The Press-Republican (2/9)
A plan to restore St. Lawrence River water levels back to historic norms was a major talking point at a recent summit in Clayton, N.Y., on combating invasive species.

Report disappointing, says Restore Our Water Intl. rep
The Expositor (1/29)
An official with Restore Our Water International (ROWI) expressed her disappointment with comments made by the International Joint Commission (IJC) on a report released on Great Lakes water diversion.

Mild winter, open water impacting Lake Huron
The Sarnia Journal (1/22)
Winterís late start has delayed ice formation on the Great Lakes, raising the potential for some extreme weather and other adverse impacts to come, Environment Canada say.

Ice jam concerns on the Manistee River as snow dwindles down
WPBN-TV - Traverse City, MI (1/19)
One issue with the recent cold is the formation of ice jams on some area rivers/streams. A river gauge on the Manistee River in northern Michigan showed a jump in river level, but the extent of an ice jam is unknown.

Mild winter keeps Great Lakes' water levels up
Detroit Free Press (1/17)
Michigan's mild start to winter has Great Lakes levels doing strange things. December saw record amounts of precipitation in many parts of the Great Lakes basin, but in the form of rain and water levels that typically decline stayed constant, or even rose.

Great Lakes Captains Association meets in Traverse City
Northern Michigan 9 & 10 News (1/13)
Every year, the Great Lakes Captains Association gets together to go over the latest information for their industry. This yearís convention wrapped up in Traverse City.

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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 December 4, 2015 (includes data summary)

Weather conditions: At the start of last weekend, weather in the Great Lakes basin was rainy and unusually warm. Temperatures fell as the weekend progressed. They were near average by the time the workweek began, and were generally above average on Tuesday and Wednesday. The basin experienced significant precipitation on Friday, but not much at all this week. In November, precipitation to Lakes Superior and Michigan-Huron was near average, while precipitation to Lakes Erie and Ontario were well below average. This weekend, temperatures will be above average, with most of the region experiencing temperatures 10 degrees above normal. They will remain above average on Monday. Precipitation throughout the entire basin is projected to be minimal this weekend and into the workweek.

Lake Level Conditions: Lake Superiorís level has remained steady over the past month. Lakes Michigan-Huron and Erie have fallen 1 and 2 inches, respectively, over the past month, while Lakes Erie and Ontario have fallen 4 to 5 inches. Currently, all of the lakes are within 2 inches of their levels of a year ago. Over the next 30 days, Lakes Superior and Michigan-Huron are predicted to fall 4 and 2 inches, respectively, while Lake St. Clair is expected to remain at its current level. Lakes Erie and Ontario are projected to rise 1 and 2 inches, respectively, during the next month. See the Daily Levels page for more water level information.

Forecasted outflows / channel conditions: Lake Superiorís outflow through the St. Maryís River is forecasted to be above average for the month of December. Lake Michigan-Huronís outflow into the St. Clair River and Lake St. Clairís outflow into the Detroit River are projected to be above average in December. Likewise, the December outflow of Lake Erie into the Niagara River is projected to be above average, and outflow of Lake Ontario into the St. Lawrence River is predicted to be above average in December.

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.

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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: February 13, 2016
Selected Photos: Copyright ©John and Ann Mahan
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