River IL

River aux Vases

Illinois • 37.8607, -90.1369

Reviewed mapped path Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

30 mi

48 km

Elevation

939′ → 358′

581 ft drop

Stream Order

Medium River

Slope

0.37%

19.4 ft/mi

Drainage

583,898 mi²

1,512,290 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

153 mi

247 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