Creek IL

Ellison Creek

Illinois • 40.7677, -90.8412

Reviewed mapped path Updated Dec 30, 2025

Checking mapped path coverage…

USGS and NOAA data is for informational purposes. Source notes

Length

25 mi

41 km

Elevation

759′ → 562′

197 ft drop

Stream Order

Medium River

Slope

0.15%

7.8 ft/mi

Drainage

76 mi²

198 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

980 mi

1,577 km to ocean

Classification

Tributary

Mid-reach

Elevation Profile

Water Quality

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

Detailed hydrology

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Data from USGS & NOAA for informational purposes only. Read source and safety notes