Lake aeration and dissolved oxygen

The goal of the lake aeration program is to ensure the safe winter operation of aeration systems and to ensure the appropriate use of aeration technology. In most cases, the use of aerators is to maintain existing populations of fishes.

It is important to realize that aerators are not the best option in all lakes. For more information on the Lake Aeration Program, to view a brochure on how the use of aeration may prevent winterkill of fish, or to obtain a permit for an aerator visit the lake aeration program web page.

In addition to its wintertime measurements of oxygen levels, the Windom area fisheries staff also rely on the public to report any winterkill observed during the spring to aide in monitoring winterkill status. If you notice any evidence of a possible winterkill during spring please contact us.

Current measured oxygen levels

Windom area fisheries staff monitor dissolved oxygen levels during the winter in many area lakes, particularly lakes with aerators. Monitoring dissolved oxygen is important to determine potential winterkill situations so that appropriate fish population assessments and stocking plans can be developed in a timely manner during the spring.

Click a county below to display lakes where oxygen levels are being measured

Cottonwood County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Bean2.2
Bingham13.2
Cottonwood12.7
Clear-
Clear (near Dundee)4.3
Mountain9.0
Double (North, South)12.4, 5.5
Eagle-
Summit-
Talcot7.9
Timber6.9
Jackson County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Boot13.5
Clear11.8
Flahtery (Skunk)5.8
Independence12.6
Little Spirit9.0
Loon6.1
Pearl9.0
Round14.7
South Heron2.4
Lincoln County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Benton6.8
Dead Coon8.4
West Dead Coon13.6
Stay2.3
Shaokotan5.3
Lyon County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Clear0.75
East Twin-
Goose9.9
IslandNot Accessible
Rock4.8
West Twin2.8
Wood10.9
Yankton4.0
Martin County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Big Twin12.6
Budd11.2
Buffalo7.2
Cedar (North, South)7.5, 7.0
Clear (Ceylon)10.3
East Chain-
Fish9.5
Clam8.9
George6.1
Imogene11.4
Iowa7.8
Okamanpeedan10.8
Sisseton8.7
Temperance9.2
Wilmert9.8
Murray County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Bloody2.7
Buffalo8.2
Corabelle2.2
Currant4.5
Fulda (North, South)0.35, 0.70
Fox1.0
Lime0.62
Louisa1.2
Sarah15.3
Shetek (North, South)6.7, 6.2
Summit9.8
Wilson (North, South)4.8, 2.5
Nobles County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Bella-
East Graham11.4
West Graham10.0
IndianNot Accessible
Kinbrae2.5
Ocheda2.7
Okabena12.3
Rock County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Split Rock-
Watonwan County
Measurements (expressed in milligrams per liter [mg/L]) less than 2 are displayed in red and indicate low dissolved oxygen levels are stressing fish and winterkill may occur if dissolved oxygen levels do not increase or fish fail to find refuge in more oxygenated areas of the lake.
LakeJan. 10-18
Fedji7.5
Kansas10.9
St. James9.1