River IL

Prairie Fork

Illinois • 38.5285, -91.2617

Reviewed mapped path Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

12 mi

19 km

Elevation

636′ → 572′

64 ft drop

Stream Order

Medium River

Slope

0.10%

5.4 ft/mi

Drainage

29 mi²

75 km²

Avg Flow

-- cfs

0.9 mph velocity

Path to Mouth

1,440 mi

2,317 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