River NJ NY PA

Wallkill River

New Jersey • 41.1179, -74.5959

Hydrography profile Updated Dec 30, 2025

Checking mapped path coverage…

USGS and NOAA data is for informational purposes. Source notes

Length

92 mi

147 km

Elevation

794′ → 14′

780 ft drop

Stream Order

Large River

Slope

0.16%

8.5 ft/mi

Drainage

703 mi²

1,821 km²

Avg Flow

1,339 cfs

1.4 mph velocity

Path to Mouth

227 mi

365 km to ocean

Classification

Tributary

Mid-reach

Elevation Profile

Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

Data from USGS & NOAA for informational purposes only. More