Overlooking Lake Monona is a long tailed effigy mound that has been referred to as a turtle, lizard, panther and water spirit. Part of the tail was cut off when Lakeland Avenue was constructed. This mound was originally part of a dense and extensive cluster of mounds that extended from the Yahara River to what is now Olbrich Park. The site was still a favored Ho-Chunk campground as late as the late 19th century. The mounds are considered sacred by modern Native Americans and should be treated with respect. The Hudson Park Mound was designated a City of Madison landmark on May 7, 1990 and is on the National Register of Historic Places.This small 4.75 acre park offers a canoe and kayak access ramp. No restrooms or drinking water available.