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LakeForecast water quality monitoring in 2024

Clean Lakes Alliance’s LakeForecast water quality monitoring program completed its 12th season in 2024. This program is entirely volunteer-implemented, with over 100 trained monitors assessing water quality conditions from nearshore and offshore locations across all five Yahara lakes (Mendota, Monona, Wingra, Waubesa, and Kegonsa). From Memorial Day through Labor Day, volunteers recorded water clarity, air and water temperature, waterfowl presence, the extent of floating plant debris, and the severity of green algae and cyanobacteria at public beaches, lakeside parks, and private piers. Submitted data can be seen in real-time on Lakeforecast.org or our free app, allowing the public to stay up to date on current lake conditions.

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Ice on Lake Mendota on January 15, 2024, courtesy Robert Bertera

Cold overnight temperatures help Lake Mendota freeze, briefly

Ice on! Cold nighttime temperatures, combined with cold water and light winds, helped Lake Mendota officially freeze on December 25, 2024, as declared by the Wisconsin State Climatology Office. Two days later, on December 27th, Lake Mendota reopened as high temperatures climbed well into the 40s. The largest lake in the Yahara Watershed froze for the first time in the 2024-2025 winter season just five days after December 20th, which is the median ice-on date for Lake Mendota. The latest date ice-on has been declared is January 30th, and that took place in 1932.

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Aquatic plants being harvested in Lake Monona (photo courtesy Dane County)

An interview with a Dane County Aquatic Plant Harvester Operator

If you’ve spent time around any of Greater Madison’s lakes, you’ve probably seen these large machines in action. Unofficially and incorrectly known as “weed cutters,” the machines and their operators play a vital role in keeping our lakes open to everyone. The proper name for the machine is aquatic plant harvester, because they’re not just cutting weeds, they’re harvesting and removing vegetation from our lakes. 

So how do they work? What are they doing? Who is out there driving them? Clean Lakes Alliance visited Lake Monona on a beautiful August day to ride along on one of Dane County’s aquatic plant harvesters driven by Donn Kidd to get some answers.

Aquatic plants being harvested in Lake Monona
Riding along with Donn Kidd on one of Dane County’s aquatic plant harvesters on Lake Monona in 2023, photo courtesy Dane County
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Frozen Assets cancels all Lake Mendota events due to poor ice conditions

Due to continued warm weather, Clean Lakes Alliance has made the decision to cancel all Frozen Assets events scheduled to take place on Lake Mendota. The decision was made after multiple days of drilling test holes in Lake Mendota, as well as speaking with experts at the University of Wisconsin-Madison, a local meteorologist, and local law enforcement officials. Events including skydiving, Kites on Mendota, snowshoeing, pond hockey, and the Mary B will not be at Frozen Assets this year.

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Ice on Lake Mendota on January 15, 2024, courtesy Robert Bertera

January cold snap helps lake freeze

Ice on! Temperatures below zero, combined with cold water and low wind, helped Lake Mendota officially freeze on January 15, 2024, as declared by the Wisconsin State Climatology Office. Lake Mendota, the largest lake in the Yahara Watershed, froze a full 26 days after December 20th, which is the median ice-on date for the largest lake in the Yahara River Watershed. The January 15th freeze is the 3rd latest freeze date since monitoring began over 170 years ago. The latest ice-on date is January 30th, and that took place in 1932.

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Image 3 - Offshore monitor training

LakeForecast water quality monitoring in 2023

Clean Lakes Alliance’s LakeForecast water quality monitoring program completed its 11th season in 2023. This program is entirely volunteer implemented, with 90 trained monitors assessing water quality conditions from nearshore and offshore locations across all five Yahara lakes (Mendota, Monona, Wingra, Waubesa, and Kegonsa). From Memorial Day through Labor Day, volunteers recorded water clarity, air and water temperature, waterfowl presence, extent of floating plant debris, and the severity of green algae and cyanobacteria at public beaches, lakeside parks, and private piers. Submitted data can be seen in real-time on lakeforecast.org or our free app allowing the general public to stay up to date on current lake conditions.

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Photo courtesy Dane County Land & Water Resources Department
Lake Wingra and Henry Vilas Park
Lake Wingra and Henry Vilas Park

Henry Vilas Park (Lake Wingra)

Henry Vilas Park is one of Madison’s oldest lakeside parks, and provides a gathering place along Lake Wingra for swimming, fishing, and even ice skating when the lagoon freezes over. The park was created from a 1904 donation from Wisconsin’s U.S. Senator, William Freeman Vilas (1840-1908), to the Madison Park and Pleasure Drive Association, an organization committed to the development of parks and scenic drives in the Madison area in the late 19th and early 20th centuries. Vilas also served as U.S. Postmaster General and Secretary of the Department of the Interior under President Grover Cleveland. Henry Vilas Park is named in memory of William’s son who died in childhood.

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