River CA

North Fork Mattole River

California • 40.3547, -124.2643

Reviewed mapped path Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

14 mi

23 km

Elevation

1,928′ → 55′

1,873 ft drop

Stream Order

Medium River

Slope

2.52%

132.9 ft/mi

Drainage

38 mi²

98 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

14 mi

22 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