River WA

South Nemah River

Washington • 46.4587, -123.8721

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

9 mi

14 km

Elevation

1,222′ → 9′

1,213 ft drop

Stream Order

Medium River

Slope

2.62%

138.2 ft/mi

Drainage

9 mi²

23 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

9 mi

14 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