River IL

South Branch

Illinois • 40.0355, -90.8114

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

7 mi

12 km

Elevation

737′ → 525′

212 ft drop

Stream Order

Stream

Slope

0.54%

28.5 ft/mi

Drainage

10 mi²

25 km²

Avg Flow

-- cfs

0.7 mph velocity

Path to Mouth

1,323 mi

2,129 km to ocean

Classification

Tributary

Mid-reach

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

Rain Radar