Aquatic Invasive Species
Contact information
For information on Lakes in Wisconsin, contact:
DNR Lake
Division of Water
Bureau of Water Quality
Clean Boats, Clean Waters Contacts

Delavan Lake -- Access Off State Hwy 50

Location:

Boats Inspected (Boats Inspected:2004=185,2005=7523,2006=6659,2007=111,2008=174,2009=158,2010=1976,2011=2654,2012=2238,2013=1485,2014=1668,2015=1842,2016=1057,2017=321,2018=225,2019=449,2020=70,2021=369,2022=351,2023=671,2024=1009|)

People Contacted (People Contacted:2004=385,2005=16035,2006=13901,2007=200,2008=358,2009=391,2010=3857,2011=5750,2012=3963,2013=3031,2014=2723,2015=2965,2016=1518,2017=735,2018=465,2019=876,2020=1433,2021=435,2022=572,2023=1566,2024=1751|)

Hours Spent (Hours Spent:2004=22.5,2005=714,2006=1488,2007=38,2008=31.5,2009=33,2010=357.75,2011=328.75,2012=358,2013=346.75,2014=339,2015=315,2016=217,2017=112,2018=95,2019=113,2020=283,2021=109,2022=88,2023=140,2024=200|)

Hours Spent - Paid vs. Volunteer (Paid Hours:2008=29,2009=33,2010=357.75,2011=328.75,2012=354.5,2013=222.75,2014=339,2015=315,2016=217,2017=112,2018=95,2019=113,2020=283,2021=109,2022=88,2023=108,2024=194|Volunteer Hours:2008=2.5,2009=0,2010=0,2011=0,2012=3.5,2013=124,2014=0,2015=0,2016=0,2017=0,2018=0,2019=0,2020=0,2021=0,2022=0,2023=32,2024=6|)

Note: for the first few years, the Clean Boats form only asked for total hours. Later, most boat inspectors used the newer form which asked for Paid vs. Volunteer.

Delavan Lake has the following aquatic invasive species:
Banded Mystery Snail, Curly-Leaf Pondweed, Eurasian Water-Milfoil, Hybrid Eurasian / Northern Water-Milfoil, Ornamental water lilies (non-native Nymphaea sp.), Pennywort, Phragmites (non-native), Purple Loosestrife, Zebra Mussel