Upper Rock River Basin

Description

Horicon Marsh, Photo by Hagerty, USFWS

Horicon Marsh, Photo by Hagerty, USFWS.

About the Basin

The Upper Rock River basin, covering 1,890 square miles, lies in south central Wisconsin's eastern ridges and lowlands geographical province (Martin, 1932). At the north end of the basin, the East, South and West branches of the Rock River come together in Horicon Marsh. From the city of Horicon, on the south edge of the marsh, the river flows south 76 miles to Fort Atkinson. The remainder of the Rock River mainstem, 62 miles, is in the Lower Rock River Basin, which extends from Fort Atkinson to the Wisconsin-Illinois border. The gradient of the Upper Rock River is very flat. The fall of the river from the upper Federal dam in the Horicon National Wildlife Refuge to the upper Watertown dam is just 34 feet over 58 miles.

The basin is bounded on the east by the Niagara escarpment and the eastern terminal moraine, formed by the Green Bay lobe during the last glaciated period in Wisconsin. The most dominant geologic features are the extensive drumlin fields in Dodge County and portions of Dane, Columbia and Jefferson counties. Principal soil types in this region are Dodge, Miami, Morley, Casco, Plano, Warsaw and Varna soil associations in upland areas. Soil associations in wetland areas are Pella, Poygan and Brookston (Hole, 1976). These soils are fertile and productive.



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Watersheds, Waters

Watershed, Water Details

Click the links below to find water resource information for specific watersheds and their waters.

Watershed Name/View DetailsWatershed Code/MapWatershed SizeLists (Streams, Lakes, Bays & Harbors)CountiesWater Management Unit (WMU)Major Drainage System
Ashippun River UR10 68.7 mi 2 UR10 Water Lists Dodge, Jefferson, Washington, WaukeshaUpper RockMississippi River
Beaver Dam River UR03 290.25 mi 2 UR03 Water Lists Columbia, Dodge, Fond du Lac, Green LakeUpper RockMississippi River
Calamus Creek UR04 30.18 mi 2 UR04 Water Lists Columbia, DodgeUpper RockMississippi River
East Branch Rock River UR13 198.99 mi 2 UR13 Water Lists Dodge, Fond du Lac, WashingtonUpper RockMississippi River
Johnson Creek UR07 45.22 mi 2 UR07 Water Lists JeffersonUpper RockMississippi River
Lower Crawfish River UR02 177.65 mi 2 UR02 Water Lists Columbia, Dane, Dodge, JeffersonUpper RockMississippi River
Maunesha River UR05 126.02 mi 2 UR05 Water Lists Columbia, Dane, Dodge, JeffersonUpper RockMississippi River
Middle Rock River UR01 95.12 mi 2 UR01 Water Lists Dodge, JeffersonUpper RockMississippi River
Oconomowoc River UR09 130.86 mi 2 UR09 Water Lists Dodge, Jefferson, Washington, WaukeshaUpper RockMississippi River
Rubicon River UR11 79.15 mi 2 UR11 Water Lists Dodge, WashingtonUpper RockMississippi River
Sinissippi Lake UR08 234.93 mi 2 UR08 Water Lists Dodge, Jefferson, WaukeshaUpper RockMississippi River
Upper Crawfish River UR06 161.18 mi 2 UR06 Water Lists Columbia, Dane, DodgeUpper RockMississippi River
Upper Rock River UR12 257.61 mi 2 UR12 Water Lists Dodge, Fond du Lac, Green LakeUpper RockMississippi River

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