Mongaup River River Levels

Last Updated: December 4, 2025

The Mongaup River is a 20-mile-long river located in Sullivan and Orange Counties in New York.


Summary

Total streamflow across the Mongaup River was last observed at 191 cfs, and is expected to yield approximately 378 acre-ft of water today; about 51% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 374 cfs, with recent peaks last observed on 2021-10-28 when daily discharge volume was observed at 4,956 cfs.

Maximum discharge along the river is currently at the Mongaup River Near Mongaup Ny reporting a streamflow rate of 137 cfs. However, the streamgauge with the highest stage along the river is the Mongaup River At Mongaup Valley Ny with a gauge stage of 3.1 ft. This river is monitored from 2 different streamgauging stations along the Mongaup River, the highest being situated at an altitude of 1,069 ft, the Mongaup River At Mongaup Valley Ny.

River Details

Last Updated 2025-12-04
Discharge Volume 378 ACRE-FT
Streamflow 190.5 cfs
-14.6 cfs (-7.12%)
Percent of Normal 50.88%
Maximum 4,956.0 cfs
2021-10-28
Seasonal Avg 374 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Mongaup River At Mongaup Valley Ny
USGS 01432900
54 cfs 3.1 ft -21.44
Mongaup River Near Mongaup Ny
USGS 01433500
137 cfs 1.52 ft 0
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

Mongaup River is a stream in the U.S. state of New York. It is a tributary to the Delaware River.
Mongaup is a name derived from an Indian language meaning perhaps "dancing feather" or "huckeberry valley". Variant spellings have been "Mangawping River", "Mingwing River", "Mon-gaw-ping River" and "Mongaap River".