River FL GA

Saint Marks River

Florida • 29.7784, -84.9939

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

39 mi

63 km

Elevation

83′ → -4′

87 ft drop

Stream Order

Medium River

Slope

0.04%

2.2 ft/mi

Drainage

265 mi²

687 km²

Avg Flow

-- cfs

1.1 mph velocity

Path to Mouth

39 mi

63 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