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| Name of Animal (if any) | Body of Water | Region | Description | Date(s) |
| Red Cedar Lake | Madison, Wisconsin, USA | Undulating serpent with saw-tooth like humps on on its back | 1891 | |
| Rock Lake | Wisconsin, USA | Sea-serpent type. Neck at least 3' long. Once hissed at a fisherman. Described as "smelly". :-) | 31 Aug 1882, 1867 | |
| Rock River | Wisconsin, USA | Click here to read the Indian legend | Indians | |
| Lake Monona | east Madison, Wisconsin, USA | Mentioned in the Wisconsin State Journal. 20-30 foot long serpent with boat-like back. Said to have eaten a dog. | 12 June 1897 | |
| Lake Pewaukee | Madison, Wisconsin, USA | Sea-serpent, "a huge green thing traveling like a gray streak", sometimes seen spouting water. A reward was offered for its capture, but no one wanted to risk it! | 1890's | |
| Oconomowoc Lake | Wisconsin | Serpent | 1890's | |
| Elkhart Lake | Madison, Wisconsin, USA | Large jaws, sparkling eyes | mid 1890's | |
| Lake Koshkonong | Wisconsin, USA | Tore up fish nets and ate pigs feeding off shore. | pre-Columbian to 1800's | |
| Lake Geneva | Wisconsin, USA | Liked to overturn small water craft and follow in the wakes of steamboats. | 1890's | |
| Delavan Lake | Wisconsin, USA | ~1900 | ||
| Lake Michigan | near Milwaukee, Wisconsin, USA | Serpentine | late 1890's to early 1900's | |
| Lake Waubeau | Madison, Wisconsin, USA | |||
| Lake Waubesa | just south of Madison, Wisconsin, USA | Giant snake-like creature seen sunning itself on the water surface. 60-70' tall, dark-green. Glittery eyes. | ||
| Lake Kegonsa | Wisconsin, USA | "vengeful and destructive" dragon |