River IL

The Sny

Illinois • 39.5921, -91.1333

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

46 mi

75 km

Elevation

464′ → 437′

27 ft drop

Stream Order

Medium River

Slope

0.01%

0.6 ft/mi

Drainage

297 mi²

770 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

523 mi

842 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