River CA

East Branch North Fork Mattole River

California • 40.3523, -124.2184

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

8 mi

12 km

Elevation

1,914′ → 299′

1,615 ft drop

Stream Order

Medium River

Slope

3.95%

208.6 ft/mi

Drainage

16 mi²

41 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

13 mi

21 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