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Green LAKE Watershed

Green Lake—Wisconsin's Deepest Inland Lake

Located in beautiful Green Lake County, Wisconsin, Green Lake originated in a valley formed by a preglacial river. Glaciation deposited terminal moraines across the western end of the valley (along present-day Highway 73), which impounded the water and created the lake 12,000-23,000 years ago.

Our Watershed

A watershed is an area of land that water flows across as it moves toward a common body of water, such as a stream, river, lake or coast. Watersheds can move across county, state, and national boundaries. In the continental U.S. there are 2,110 watershed. Expand it to include Alaska, Hawaii, and Puerto Rico there are 2, 267 watersheds. View how watersheds work.

Green Lake is part of the Big Green Lake Watershed, which is primarily located in Green Lake County. About 40% extends into Fond du Lac County. A portion of the watershed also edges along the southwest corner of Winnebago County. Green Lake's outlet is the Puchyan River, which drains into the Fox River and ultimately into Lake Michigan at Green Bay.

The Big Green Lake Watershed also includes Spring Lake, Little Twin Lake and Big Twin Lake.

Tributaries

There are eight streams, also known as tributaries, flowing into Big Green Lake. Some of these tributaries are classified as exceptional waters while others are listed on the impaired waters list. Big Green Lake's tributaries are: Dakin Creek, Hill Creek, Roy Creek, Wuerches Creek, White Creek, Silver Creek, Spring Creek and Assembly Creek.

Find out which waters are impaired and why.

Basin

We all live within a river basin. Even if we don’t live near a lake or river, the water on our land still drains to a river, estuary, or lake.

Water collected in a basin flows to a central body of water and out to sea. All of the water in our watershed flows to the Upper Fox River Basin. Running from the borders of Green Lake and Columbia Counties southwest to Portage and back northeast to Lake Winnebago, the Upper Fox River Basin includes all of Marquette County and portions of Green Lake, Columbia, Fond du Lac, Waushara, Calumet, Adams, and Winnebago Counties. The Big Green Lake watershed is one of 15 watersheds draining into the Upper Fox River Basin.

Three basins, the Upper Fox, Lower Fox, and Wolf Basins flow to Lake Michigan through the Bay of Green Bay. Learn more about the Upper Fox River Basin.

Watershed Stats

Watershed Area 68,676 acres
Streams and Rivers 141 miles
Lakes 655 acres
Wetlands 5,102 acres

Land Area

Agricultural 56%
Open Water 12%
Wetlands 10%

Green Lake
Deepest natural inland lake in Wisconsin.

Greatest Depth 237 ft.
Average Depth 100 ft.
Surface Area 7,346 acres
Length 7.3 miles
Width 2 miles
Shoreline 27.3 miles

Water Source

Rainfall 51%
Runoff 41%
Springs 8%

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landusemap

Green Lake Watershed Map by Land Usage
Click on the map to view larger image.

watershed

Green Lake Sub Watershed Map
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Big Green Lake is part of the Upper Fox River Basin.