River CO

West Fork San Juan River

Colorado • 37.4766, -106.9329

Hydrography profile Updated Jan 19, 2026

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USGS and NOAA data is for informational purposes. Source notes

Length

18 mi

29 km

Elevation

12,333′ → 7,550′

4,783 ft drop

Stream Order

Medium River

Slope

5.03%

265.6 ft/mi

Drainage

86 mi²

222 km²

Avg Flow

186 cfs

1.5 mph velocity

Path to Mouth

1,275 mi

2,052 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