River CA

Susan River

California • 40.4066, -120.7266

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

69 mi

111 km

Elevation

6,581′ → 3,993′

2,589 ft drop

Stream Order

Large River

Slope

0.71%

37.5 ft/mi

Drainage

1,080 mi²

2,797 km²

Avg Flow

-- cfs

1.4 mph velocity

Path to Mouth

63 mi

102 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 Susan River

There are 2 boat ramps, launches, and public access points on Susan River.