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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
Lawmakers continue push for Plan 2014 at Lake Ontario-St. Lawrence River system
Watertown Daily Times (12/23)
A large delegation of lawmakers reiterated their support of a Lake Ontario-St. Lawrence River water level plan designed to allow larger seasonal variations.

Monroe County, N.Y. Executive decries lake-level plan
Democrat & Chronicle (12/22)
New York's Monroe County Executive says that the proposed Lake Ontario-St. Lawrence River water level plan does not work for property owners and local communities on Lake Ontario.

Lakes Huron, Michigan unusually high
The London Free Press (12/20)
Water levels in Lakes Huron and Michigan are bucking the seasonal trend by remaining high when they normally drop.

EDITORIAL: A lifesaver for Lake Ontario homeowners
Rochester Democrat and Chronicle (12/19)
The Democrat and Chronicle's editorial board says that any plan to manage water levels on Lake Ontario should protect the environment, businesses, and homeowners.

COMMENTARY: Lake Ontario plan a washout
Democrat & Chronicle (12/19)
A member of a group concerned about proposed changes to water levels in Lake Ontario says Plan 2014 misses the mark on wetland protections.

New tool simulates climate change impact on Great Lakes shores
Great Lakes Echo (12/18)
A new computer tool is helping official planners and others see what varying Great Lakes water levels do to the shoreline.

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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 26, 2014 (includes data summary)

Weather conditions: The Great Lakes Basin experienced average or slightly below average temperatures over the past weekend followed by significant warming during the first half of the workweek with daytime highs reported between 10°F and 20°F above normal. Precipitation was above average over most of the basin due to a weather system pushing in from the south bringing warm air and rain. Temperatures are expected to cool with temperatures near average over the weekend and continuing to drop into next week with expected daytime highs near 10°F below normal.

Water Level Conditions: Lakes Superior and Michigan-Huron are 11 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 10 and 7 inches, respectively, above what they were at this time last year, while, Lake Ontario is 5 inches below its level of a year ago. Lakes Superior and Michigan-Huron are forecasted to fall 4 and 1 inches, respectively, over the next 30 days. During the same time period, Lake St. Clair and Lake Erie are expected to remain at their current levels, and Lake Ontario is predicted to rise 4 inches. 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 December. Lake Michigan-Huron’s outflow into the St. Clair River is predicted to be above average and Lake St. Clair’s outflow into the Detroit River is predicted to be above average in December. 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 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.

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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: December 26, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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