River IL

Wash Lake Slough

Illinois • 40.2024, -89.8977

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

2 mi

3 km

Elevation

504′ → 485′

20 ft drop

Stream Order

Headwater

Slope

0.24%

12.6 ft/mi

Drainage

2 mi²

5 km²

Avg Flow

-- cfs

0.5 mph velocity

Path to Mouth

1,323 mi

2,129 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