River IL

Grove Branch

Illinois • 39.0543, -89.6442

Reviewed mapped path Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

12 mi

19 km

Elevation

681′ → 529′

152 ft drop

Stream Order

Medium River

Slope

0.24%

12.7 ft/mi

Drainage

15 mi²

39 km²

Avg Flow

-- cfs

0.9 mph velocity

Path to Mouth

441 mi

709 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