River IL

O'Connell Slough

Illinois • 40.8285, -91.0977

Reviewed mapped path Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

4 mi

6 km

Elevation

523′ → 522′

1 ft drop

Stream Order

Medium River

Slope

0.00%

0.2 ft/mi

Drainage

210,114 mi²

544,193 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

950 mi

1,529 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