Great Lakes Water Levels

Great Lakes water levels constitute one of the longest high quality hydrometeorological data sets in North America with reference gage records beginning about 1860 with sporadic records back to the early 1800's. These levels are collected and archived by NOAA's National Ocean Service.

Water Level Plots

Superior--Daily levels compared with last year's level
Michigan, Huron, St. Clair, and Erie-- Daily levels compared with last year's level
Ontario-- Daily levels compared with last year's level
Superior--Daily levels compared with monthly Min, Max, and Mean levels
Michigan-Huron--Daily levels compared with monthly Min, Max, and Mean levels
St. Clair--Daily levels compared with monthly Min, Max, and Mean levels
Erie--Daily levels compared with monthly Max, Min, and Mean levels
Ontario--Daily levels compared with monthly Max, Min and Mean levels

The Great Outdoors

Lake Superior
Outdoors

Virtual Tourist

Scenic Photo Galleries

Wisconsin Sea Grant

Minnesota Sea Grant

What is a seiche? (pronounced "saysh")

Like water sloshing in a bathtub, seiches are tide-like rises and drops in Great Lakes coastal water levels caused by prolonged strong winds that push water toward one side of the lake, causing the water level to rise on the downwind side of the lake and to drop on the upwind side. When the wind stops, the water sloshes back and forth, with the nearshore water level rising and falling in decreasingly small amounts on both sides of the lake until it reaches equilibrium.

For Water Temperatures of the Great Lakes

Temperatures in Fahrenheit

Kenora On	Grand Marais Min	Ottawa Canada	London England
Thunder Bay On	Duluth, Min	Washington USA	Moscow, Russia
Wawa Ontario	Marquette Mich	Miami, Florida	Basrah, Iraq
Sault Ste Marie Ontario	Sault Sainte Marie, Michigan	San Francisco, California	Adelaide, Australia

Great Lakes Information

Great Lakes Water Levels

Great Lakes
Information