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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
Lake Huron shoreline erosion now a concern
Blackburn News (10/29)
Rising Lake Huron water levels raise shoreline erosion concerns for nearshore communities.

NY-24 Debate: Where Rep. Dan Maffei and John Katko stand on plan to alter Lake Ontario water levels
Auburn Citizen (10/28)
A controversial plan to regulate the lowering and raising of Lake Ontario water levels was one of several topics addressed during Monday's 24th Congressional District debate on Time Warner Cable News.

Freshwater Summit to address Great Lakes issues
Grand Traverse Insider (10/26)
Speakers will discuss climate change, invasive species, water levels and the economic impacts of the various issues facing the Great Lakes.

County legislators endorse St. Lawrence River water level plan
The Watertown Daily Times (10/21)
A new plan to better regulate water levels in the St. Lawrence River and Lake Ontario was unanimously approved Monday by a committee of St. Lawrence County, N.Y., legislators.

St. Lawrence County lawmakers support plan to regulate St. Lawrence River water flow, levels
North Country Now (10/21)
The operations committee in St. Lawrence County, N.Y., is supporting a proposed water plan that would regulate flows and levels on the St. Lawrence River.

Autumn anomaly: Deepest Great Lakes' levels rising
Detroit Free Press (10/20)
As leaves are falling, the deepest of the Great Lakes' water levels are rising. And that almost never happens.

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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 October 24, 2014 (includes data summary)

Weather conditions: Temperatures in the Great Lakes basin have oscillated between above average and below average during the past 7 days. Notable precipitation took place throughout much of the basin last weekend and on Monday. This weekend, temperatures in the region are predicted to be generally above average. These above average temperatures will continue into the early part of the workweek when several cities including Chicago, IL, and Flint, MI, will see temperatures over ten degrees above average on Monday. Rain showers are forecasted for the majority of the basin on Sunday and Monday.

Water Level Conditions: Lakes Superior and Michigan-Huron are both 10 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 8 and 16 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 predicted to decline 2 inches over the next 30 days. Lakes St. Clair, Erie and Ontario are projected to fall 3 to 4 inches over the next month. See the Great Lakes Water Levels web page for more water level information.

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

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: October 31, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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