River WA

South Channel

Washington • 45.5051, -123.9218

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

6 mi

10 km

Elevation

6′ → 0′

6 ft drop

Stream Order

Large River

Slope

0.02%

1.1 ft/mi

Drainage

441 mi²

1,142 km²

Avg Flow

-- cfs

1.8 mph velocity

Path to Mouth

8 mi

12 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

Access Sites on South Channel

There are 1 boat ramps, launches, and public access points on South Channel.