River IL

Lake Fork

Illinois • 39.8063, -88.4762

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

48 mi

77 km

Elevation

684′ → 434′

250 ft drop

Stream Order

Medium River

Slope

0.10%

5.2 ft/mi

Drainage

261 mi²

675 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

1,467 mi

2,361 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

Water Level Gauges on Lake Fork

There are 1 USGS water level monitoring stations on Lake Fork providing real-time flow and stage data.

There are 2 boat ramps, launches, and public access points on Lake Fork.