River IL

River des Peres Drainage Channel

Illinois • 38.5764, -90.3017

Reviewed mapped path Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

6 mi

10 km

Elevation

411′ → 382′

29 ft drop

Stream Order

Medium River

Slope

0.09%

4.6 ft/mi

Drainage

85 mi²

221 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

181 mi

291 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