The Ashippun River is a 33.2 miles (53.4 km) tributary of the Rock River in southeastern Wisconsin

Wisconsin

Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The Ashippun's watershed lies in Dodge

Dodge County, Wisconsin

Dodge County is a county located in the U.S. state of Wisconsin. As of 2010, the population was 88,759. Its county seat is Juneau.-Geography:According to the U.S...

, Washington and Waukesha

Waukesha County, Wisconsin

Waukesha County is a county in the U.S. state of Wisconsin. As of 2008, the population was 380,629. Its county seat is Waukesha.-History:The part of Wisconsin that Waukesha County now occupies was a part of Michigan when Milwaukee County was organized in September 1834. On July 4, 1836, the...

 counties. Its tributaries include Mud Run, Dawson Creek and Davey Creek.

Description

From its headwaters in a small wetland and agricultural area, the Ashippun River flows southwest through Druid Lake

Druid Lake

Druid Lake is a kettle lake located in the town of Erin, Wisconsin, Washington County, Wisconsinlocated near Hartford, Wisconsin. Druid Lake is a natural glacial-formed lake...

 to the Rock River. There are 12 intermittent and 5 perennial tributaries to the Ashippun River. It has a low gradient of 6 feet (1.8 m) per mile.

Fishing

An impoundment at Monterey

Monterey, Wisconsin

Monterey is an unincorporated community located in the town of Oconomowoc, in Waukesha County, Wisconsin, United States. Monterey is located near Wisconsin Highway 67 north of the city of Oconomowoc....

 and several structures upstream have created water and fishery qualities similar to those of a lake. Northern pike

Northern Pike

The northern pike , is a species of carnivorous fish of the genus Esox...

 and bass

Bass (fish)

Bass is a name shared by many different species of popular gamefish. The term encompasses both freshwater and marine species. All belong to the large order Perciformes, or perch-like fishes, and in fact the word bass comes from Middle English bars, meaning "perch."-Types of basses:*The temperate...

 offer limited fishing. In addition, the river has been found to contain the rare Least Darter

Etheostoma

Etheostoma is a diverse genus of small freshwater fish in the family Percidae. It contains nearly 140 member species. Most are native to North America. They are commonly known as darters although the term "darter" is shared by several other genera...

 (Etheostoma microperca

Etheostoma microperca

The common name of Etheostoma microperca is the least darter. It is one of the 324 fish species found in Tennessee....

). Carp

Carp

Carp are various species of oily freshwater fish of the family Cyprinidae, a very large group of fish native to Europe and Asia. The cypriniformes are traditionally grouped with the Characiformes, Siluriformes and Gymnotiformes to create the superorder Ostariophysi, since these groups have certain...

are also available in quantity.