River IL

Clark Branch

Illinois • 40.7350, -89.9052

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

16 mi

25 km

Elevation

754′ → 449′

306 ft drop

Stream Order

Medium River

Slope

0.37%

19.5 ft/mi

Drainage

14 mi²

36 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

1,395 mi

2,245 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