Water Levels and More

Great Lakes Water Levels 

Great Lakes water levels constitute one of the longest high quality hydro meteorological 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

Daily levels compared with last year's levels

Superior
Michigan, Huron, St. Clair, and Erie
Ontario

Daily levels compared with monthly Min, Max, and Mean levels

Superior
Michigan-Huron
St. Clair
Erie
Ontario

 

Hydrographs

A hydrograph provides a way of seeing seasonal and yearly changes in the flow or discharge of a waterway. The hydrographs for the Great Lakes period of record (starting in 1860 or 1900) illustrate different water regimes over time.

The data files below contain the annual average water level for every year as well at the long-term mean level in meters, IGLD85.

Hydrographs

Superior
Michigan-Huron
St. Clair
Erie
Ontario

Data Files (.csv)

Superior
Michigan-Huron
St. Clair
Erie
Ontario

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
 

 

Click for Kenora, Ontario Forecast
Kenora On
Click for Grand Marais, Minnesota Forecast
Grand Marais Min
Click for Ottawa, Ontario Forecast
Ottawa Canada
Click for Thunder Bay, Ontario Forecast
Thunder Bay On
Click for Duluth, Minnesota Forecast
Duluth, Min
Click for Washington, District of Columbia Forecast
Washington USA
Click for Wawa, Ontario Forecast
Wawa Ontario
Click for Marquette, Michigan Forecast
Marquette Mich
Click for Miami, Florida Forecast
Miami, Florida
Click for Sault Ste Marie, Ontario Forecast
Sault Ste Marie
Ontario
Click for Sault Sainte Marie, Michigan Forecast
Sault Sainte Marie, Michigan
Click for San Francisco, California Forecast
San Francisco, California

 

Highways around Lake Superior

Highways

The Lake Superior Circle Tour in northern Wisconsin (highway 13), loops around Lake Superior state highways in the US states of Michigan, Minnesota (highway 61) and Wisconsin and provincial highways in the Canadian province of Ontario (highway 17). These highways are usually the closest to the lake.

Travel Lake Superior Circle Tour

Thunder Bay Amethyst Mine