River NY

South Branch Grass River

New York • 44.2692, -74.8634

Hydrography profile Updated Jan 19, 2026

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USGS and NOAA data is for informational purposes. Source notes

Length

48 mi

77 km

Elevation

1,932′ → 805′

1,127 ft drop

Stream Order

Medium River

Slope

0.45%

23.5 ft/mi

Drainage

140 mi²

362 km²

Avg Flow

239 cfs

1.4 mph velocity

Path to Mouth

176 mi

283 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