Stream IL

Johnny Run

Illinois • 41.1868, -88.4918

Hydrography profile Updated Dec 30, 2025

Checking mapped path coverage…

USGS and NOAA data is for informational purposes. Source notes

Length

30 mi

48 km

Elevation

733′ → 530′

203 ft drop

Stream Order

Medium River

Slope

0.13%

6.8 ft/mi

Drainage

54 mi²

139 km²

Avg Flow

-- cfs

0.9 mph velocity

Path to Mouth

781 mi

1,257 km to ocean

Classification

Tributary

Mid-reach

Elevation Profile

Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

Data from USGS & NOAA for informational purposes only. More