River WI MI MN

East Branch Rock River

Wisconsin • 43.5178, -88.5084

Hydrography profile Updated Dec 27, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

45 mi

72 km

Elevation

1,033′ → 858′

176 ft drop

Stream Order

Medium River

Slope

0.07%

3.9 ft/mi

Drainage

190 mi²

493 km²

Avg Flow

134 cfs

1.1 mph velocity

Path to Mouth

1,809 mi

2,911 km to ocean

Classification

Headwater

Source Stream

Elevation Profile

Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

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Data from USGS & NOAA for informational purposes only. Read source and safety notes

Access Sites on East Branch Rock River

There are 4 boat ramps, launches, and public access points on East Branch Rock River.