Delaware And Raritan Canal At Port Mercer flow report
As of July 13, 2026, Delaware And Raritan Canal At Port Mercer is flowing at 140 cfs with a gage height of 55.19 ft, holding steady over the past 24 hours. Source: USGS gauge #01460440, refreshed throughout the day.
Historical Data
Delaware And Raritan Canal At Port Mercer at a glance
How Delaware And Raritan Canal At Port Mercer is running right now, where it sits on the map, and the key gauge stats.
Delaware And Raritan Canal At Port Mercer is flowing at 140 cfs, with the water sitting 55.19 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #01460440 in New Jersey. Over the past 10 days the average has been 148 cfs, peaking at 167 cfs.
Over the next 5 days, Delaware And Raritan Canal At Port Mercer Nj is expected to hold near today's 140 cfs, toward roughly 132 cfs by 2026-07-18 (likely range 110-159 cfs) -- drier than normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the New Jersey flow report.
Streamflow Forecast
Powered by PULSE — Snoflo’s Predictive Unified Learning & Simulation Engine, which learns from how this river has answered every past storm, snowmelt, and dry spell to forecast where it’s headed with a precision generic models can’t match.
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Delaware And Raritan Canal At Port Mercer
The canal is fed by several sources, including the Delaware River, Millstone River, and Stony Brook. The canal's flow is affected by seasonal trends, with higher flows usually occurring during the winter and spring months due to increased precipitation and snowmelt. There are several dams along the canal, including the Princeton Dam, which regulates water levels in the canal. Interestingly, during the summer months, the canal is used for recreational purposes, such as kayaking and fishing. Overall, the hydrology of the Delaware and Raritan Canal at Port Mercer, NJ, is an important aspect of the local ecosystem and has both practical and recreational uses.
Nearby streamflow levels
Cross-check Delaware And Raritan Canal At Port Mercer's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Delaware And Raritan Canal At Port Mercer Nj | 140 cfs |
| Stony Brook At Princeton Nj | 14 cfs |
| Assunpink Creek Near Clarksville Nj | 27 cfs |
| Delaware And Raritan Canal At Kingston Nj | 114 cfs |
| Assunpink Creek At Trenton Nj | 53 cfs |
| Delaware River At Trenton Nj | 6,470 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Delaware And Raritan Canal At Port Mercer. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| Highstown 2w | 0 in |
| Flemington 5 Nnw | 0 in |
| Freehold-Marlboro | 0 in |
| Clinton Twp 3.9 N | 0 in |
| Califon 0.6 Nw | 0 in |
| Mendham 1.5 W | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Delaware And Raritan Canal At Port Mercer.
Boat launches
See all →
River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Delaware And Raritan Canal At Port Mercer in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Delaware And Raritan Canal At Port Mercer crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Delaware And Raritan Canal At Port Mercer
Where does the streamflow data for Delaware And Raritan Canal At Port Mercer come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 01460440. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Delaware And Raritan Canal At Port Mercer rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free Delaware And Raritan Canal At Port Mercer report
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