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Great Lakes Levels and Hydrology
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Levels & Hydrology Section: Home | Levels | Hydrology | Flows

What's New
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.

Why are the Great Lakes on the rise?
NPR (10/20)
During the late summer and early fall, the water level on the Great Lakes usually drops several inches. This year, three of those lakes, Superior, Michigan and Huron, have seen the opposite happen - rising water levels.

Taking a look at Lake Huron's high water level
The Sudbury Star (10/18)
Lake Huron was, and is now again, way above what is regarded as "chart datum" by the Canadian Coast Guard -- a big change from a couple of summer's ago when we all were complaining about the lake's low level.

New water level plan for St. Lawrence River under consideration by county legislature
North County Now (10/11)
The St. Lawrence County Board of Legislators operations committee will consider supporting a water management plan for the St. Lawrence River.

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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 September 19, 2014 (includes data summary)

Weather conditions: Fall like weather arrived in the Great Lakes basin this week. Other than some light precipitation to start the work week, conditions were largely dry across the region. Look for scattered showers at times this weekend accompanied by warmer temperatures. To date in September, the Great Lakes basin as a whole has received above average precipitation.

Water Level Conditions: Lakes Superior and Michigan-Huron are 9 and 19 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 14 and 7 inches, respectively, above what they were at this time last year, while Lake Ontario is 1 inch above its level from a year ago. Lakes Superior and Michigan-Huron are predicted to fall 1 and 2 inches, respectively over the next month. Lakes St. Clair, Erie, and Ontario are projected to fall 6, 5, and 6 inches, respectively, over the next 30 days. 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 September. Lake Michigan-Huronís outflow into the St. Clair River and Lake St. Clairís outflow into the Detroit River are predicted to be near average in September. 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 September.

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 23, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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