Millstone River River Levels

Last Updated: December 4, 2025

The Millstone River is a 38-mile-long tributary of the Raritan River in central New Jersey.


Summary

Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Millstone River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Millstone River, the highest being situated at an altitude of ft, the .

       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Millstone River At Blackwells Mills Nj
USGS 01402000
357 cfs 2.37 ft -9.39
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Millstone River is a 38.6-mile-long (62.1 km) tributary of the Raritan River in central New Jersey in the United States.The Millstone River begins in western Monmouth County and flows northward through southern Somerset County into the Raritan River at Manville. Almost three quarters of its length is paralleled by the Delaware and Raritan Canal. Both the Millstone River and parallel canal provide drinking water to portions of central New Jersey and provide recreational uses as well.