Carlls River At Babylon Flow Report
As of July 21, 2026, Carlls River At Babylon is flowing at 19 cfs with a gage height of 0.65 ft, receding 71% over the past 24 hours. Source: USGS gauge #01308500, refreshed throughout the day.
Historical Data
Carlls River At Babylon at a glance
How Carlls River At Babylon is running right now, where it sits on the map, and the key gauge stats.
Carlls River At Babylon is flowing at 19 cfs, with the water sitting 0.65 ft at the gage. Flow is down 71% since yesterday as the gauge recedes.
This is USGS gauge #01308500 in New York. Over the past 10 days the average has been 18 cfs, peaking at 66 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the New York flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #01308500).
Estimate flows at an ungauged site
Drainage-area ratio transfer from this gauge . Most reliable for hydrologically similar sites in the same watershed with area ratios between roughly 0.5 and 1.5.
Percentiles are flow-duration values computed from this gauge’s observed daily record as archived by Snoflo. Return periods are Weibull plotting-position estimates from observed annual maxima, provided as general reference context only. Always verify against official USGS NWIS records. Part of Snoflo for Engineering.
Streamflow Forecast
Over the next 5 days, Carlls River At Babylon Ny is expected to recede from today's 19 cfs, toward roughly 16 cfs by 2026-07-25 (likely range 11-24 cfs) -- about normal for the date.
Powered by PULSE — Snoflo’s forecast engine, trained on this gauge’s full record of storms, snowmelt, and dry spells.
| Date | Expected (p50) | Likely range (p25–p75) | vs normal | Projected stage |
|---|
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.
Carlls River At Babylon
It is a tidal stream that is influenced by the Atlantic Ocean. The river is fed by numerous small tributaries that drain the surrounding urban and suburban communities. The most significant tributaries are the Little East Neck and Southards Ponds. There are no major dams on the Carlls River, but there are some weirs and culverts that regulate water flow. The river's flow is highly influenced by seasonal precipitation and tidal cycles. During the summer, flow rates can decrease significantly due to lower rainfall and increased evaporation. The river supports a diverse aquatic ecosystem with various fish species, including striped bass, white perch, and eels. It is also a popular location for recreational activities, such as fishing and kayaking.
Nearby streamflow levels
Cross-check Carlls River At Babylon's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Carlls River At Babylon Ny | 19 cfs |
| Sampawams Creek At Babylon Ny | 6 cfs |
| Massapequa Creek At Massapequa Ny | 2 cfs |
| Connetquot Bk Nr Central Islip Ny | 17 cfs |
| Nissequogue River Near Smithtown Ny | 31 cfs |
| Cold Spring Brook At Cold Spring Harbor Ny | 2 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Carlls River At Babylon. 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 |
|---|---|
| Vanderbilt Museum | 0 in |
| Norwalk 2.9 Nnw | 0 in |
| New Canaan 1.9 Ene | 0 in |
| Baiting Hollow | 0 in |
| Ridgefield 1.9 Sse | 0 in |
| Shelton 1.3 W | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Carlls River At Babylon.
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 Carlls River At Babylon in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Carlls River At Babylon crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Carlls River At Babylon
Where does the streamflow data for Carlls River At Babylon come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 01308500. 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 Carlls River At Babylon 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 Carlls River At Babylon report
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