Delaware and Raritan Canal at Port Mercer NJ water level

Name: Delaware and Raritan Canal at Port Mercer NJ water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Canal gauge, Delaware and Raritan Canal, New Jersey, United States

Directions

Normal for late October

Flow

127cfs Down 8.0 cfs over the last 24 hours

Measured Oct 21, 2026, 01:15 AM EDT (33 min ago)

Water temperature: 57 °F

History

7 days

Flow Normal range (10–90 %)

What this means

The gauge at Delaware and Raritan Canal at Port Mercer NJ reads 127 cfs, a normal level for late October.

That puts it 11.0 cfs below the median of 138 cfs for late October, based on 35 years of readings.

The level is falling, down 8.0 cfs over the past 24 hours. Over the past 30 days it has moved between 106 cfs and 141 cfs.

The sensor also reports a water temperature of 57 °F.

Compared with 35 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 138 cfs11.0 cfs below the median for this date
Normal for this date: 100 cfs – 155 cfs8 years in 10 fall in this range (35 years of records)

Weather at the gauge

No rain in the last 3 days.

20 Tue 70° 43° – Wind 12 mph

21 Wed 64° 46° – Wind 13 mph

22 Thu 67° 42° – Wind 11 mph

23 Fri 59° 42° – Wind 11 mph

24 Sat 60° 38° – Wind 4 mph

25 Sun 63° 40° – Wind 7 mph

26 Mon 67° 43° – Wind 8 mph

Forecast: Open-Meteo

Sunrise 07:16 AM Sunset 06:12 PM Daylight 10 hr, 55 min Waxing gibbous 74%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Stony Brook at Princeton NJRiver gauge, Stony Brook	1.72 ft	Below flood stage	−0.03 ft	2.0 mi
Assunpink Creek near Clarksville NJRiver gauge, Assunpink Creek	4.02 ft	Below flood stage	−0.05 ft	2.5 mi
Assunpink Creek below STP near Mercerville NJRiver gauge, Assunpink Creek	2.55 ft	Below flood stage	−0.05 ft	4.5 mi
Shabakunk C at Sylva Lake Dam at Ewingville NJRiver gauge, Shabakunk C	1.4 cfs	Low	±0	5.2 mi
Assunpink Creek at Trenton NJRiver gauge, Assunpink Creek	3.03 ft	Below flood stage	−0.02 ft	6 mi
Delaware River at Trenton NJRiver gauge, Delaware River	8.94 ft	Below flood stage	−0.13 ft	8 mi
D&R Ca feeder US of gate at Washington Crossing NJRiver gauge, D&R Ca feeder US of gate	144 cfs	Low	−2.0 cfs	10 mi
Delaware River at Washington Crossing NJRiver gauge, Delaware River	−0.95 ft	Below flood stage	−0.25 ft	10 mi

Questions and answers

What is a normal level for the Delaware and Raritan Canal at Port Mercer NJ in late October?

The median for late October is 138 cfs. In 8 years out of 10 the reading falls between 100 cfs and 155 cfs, based on 35 years of records.

What is the water level of Delaware and Raritan Canal at Port Mercer NJ today?

On Oct 21, 2026, 01:15 AM EDT, the flow was 127 cfs. Down 8.0 cfs over the last 24 hours.

Is Delaware and Raritan Canal at Port Mercer NJ rising or falling?

Down 8.0 cfs over the last 24 hours. Down 7.5 cfs over the last 7 days.

Is the level of Delaware and Raritan Canal at Port Mercer NJ normal?

Normal for late October. Compared with 35 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01460440 (Agency page)
Coordinates: 40.30444, -74.68500 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Flow	127 cfs	2026-10-21 05:15	Provisional
Water temperature	57 °F	2026-10-21 05:15	Provisional

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How to cite

U.S. Geological Survey: Delaware and Raritan Canal at Port Mercer NJ (usgs:01460440). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/new-jersey/delaware-and-raritan-canal-at-port-mercer-nj

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer