River OK

Elm Fork Trinity River

Oklahoma • 33.6361, -97.3701

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

125 mi

202 km

Elevation

1,206′ → 397′

809 ft drop

Stream Order

Large River

Slope

0.12%

6.5 ft/mi

Drainage

2,540 mi²

6,579 km²

Avg Flow

-- cfs

1.8 mph velocity

Path to Mouth

599 mi

964 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