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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
Marina operators eager for boating season
St. Thomas Times-Journal (4/16)
Higher water levels in the Great Lakes are leaving marina operators and tourism officials hopeful about the coming season.

Why it's a big deal that half of the Great Lakes are still covered in ice
The Atlantic Cities (4/14)
As the Great Lakes slowly lose their historically large ice covers over the next few months, the domino effects could include lingering cold water, delayed seasonal shifts, and huge jumps in water levels.

Wasaga Beach residents continue to watch water levels rise
CTV News (4/9)
Residents are watching rising water levels closely at the mouth of the Nottawasaga River in Wasaga Beach, Ont.

Lake Michigan and Lake Huron water levels are rising, but how big a jump is expected?
MLive (4/9)
Lake Michigan and Lake Huron water levels have started their annual rise, and the forecast is out for the projected rise in water levels this summer.

COMMENTARY: Georgian Bay water drop: Where did the water go?
Peterborough This Week (4/2)
In the middle Great Lakes, water levels have been dropping steadily over the course of only a few generations and they show no sign of stopping, but if sills are successfully installed, things could get better.

COMMENTARY: Eastman park permit could set precedent
Rochester City Newspaper (4/1)
A business park in Rochester, NY with a self-contained, specialized utilities system that depends on large quantities of water from Lake Ontario is applying to withdraw 54 million gallons of lake water per day.

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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 April 4, 2014 (includes data summary)

Weather conditions: Temperatures were generally near average throughout the Great Lakes basin last weekend and this week through Wednesday. The overall basin experienced lower temperatures in March than it typically does, and all of the Great Lakes received less precipitation than usual for March. Precipitation was minimal throughout the Great Lakes basin this past weekend and this continued through Wednesday. Temperatures are projected to be generally near average this weekend, and significant precipitation is expected throughout the majority of the basin on Friday and Monday.

Water Level Conditions: Lakes Superior and Michigan-Huron are 15 and 13 inches, respectively above their levels of a year ago. Lakes St. Clair and Erie are 10 and 6 inches, respectively, above what they were at this time last year, while Lake Ontario is near its level of a year ago. Lakes Superior and Michigan-Huron are predicted to climb 3 and 5 inches, respectively, over the next 30 days. Lakes St. Clair and Erie are both projected to rise 4 and 5 inches, respectively in the next month, while Lake Ontario will rise 8 inches. Ice build-up in the connecting channels can cause significant water level fluctuations, especially in Lake St. Clair. 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 predicted to be above average for the month of April. Lake Michigan-Huronís outflow into the St. Clair River is predicted to be below average, while Lake St. Clairís outflow into the Detroit River is expected to be near average. In addition, the outflow of Lake Erie into the Niagara River and Lake Ontarioís outflow into the St. Lawrence River are projected to be near average in April.

Alerts: Official records are based on monthly average water levels and not daily water levels. Lake Michigan-Huron is below chart datum. 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. 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: April 21, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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