River LA

Southwest Pass

Louisiana • 29.0693, -89.3067

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

19 mi

30 km

Elevation

-1′ → -2′

1 ft drop

Stream Order

Major River

Slope

0.00%

0.1 ft/mi

Drainage

992,919 mi²

2,571,650 km²

Avg Flow

-- cfs

4.0 mph velocity

Path to Mouth

18 mi

29 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