Ashuelot River Below Surry Mount Dam Flow Report
As of July 26, 2026, Ashuelot River Below Surry Mount Dam is flowing at 18 cfs with a gage height of 4.79 ft, receding 20% over the past 24 hours. Source: USGS gauge #01158000, refreshed throughout the day.
Historical Data
Ashuelot River Below Surry Mount Dam at a glance
How Ashuelot River Below Surry Mount Dam is running right now, where it sits on the map, and the key gauge stats.
Ashuelot River Below Surry Mount Dam is flowing at 18 cfs, with the water sitting 4.79 ft at the gage. Flow is down 20% since yesterday as the gauge recedes.
This is USGS gauge #01158000 in New Hampshire. Over the past 10 days the average has been 18 cfs, peaking at 23 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the New Hampshire flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #01158000).
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, Ashuelot River Below Surry Mt Dam is expected to hold near today's 23 cfs, toward roughly 21 cfs by 2026-07-30 (likely range 4-119 cfs) -- running well below the seasonal normal.
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.
Ashuelot River Below Surry Mount Dam
The river is fed by several tributaries, including Stonewall Brook and White Brook. Seasonal trends show higher flows in spring from snowmelt and precipitation, while summer and fall have lower flows. The river is home to several species of fish, including brook trout and smallmouth bass. The hydrology of the area is interesting due to the presence of an active aquifer that contributes to groundwater recharge and base flow. The Ashuelot River is also a popular spot for paddling and fishing.
Nearby streamflow levels
Cross-check Ashuelot River Below Surry Mount Dam's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Ashuelot River Below Surry Mount Dam | 18 cfs |
| Ashuelot River Near Gilsum | 13 cfs |
| Otter Brook Below Otter Brook Dam | 12 cfs |
| Ashuelot River Above The Branch | 21 cfs |
| Ashuelot River At West Swanzey | 75 cfs |
| S Branch Ashuelot River At Webb | 25 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Ashuelot River Below Surry Mount Dam. 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 |
|---|---|
| Keene | 0 in |
| Nohrsc Westminster 5.5 Nw | 0 in |
| Hinsdale 2.5 Nnw | 0 in |
| Brattleboro 0.7 S | 0 in |
| Edward Macdowell Lake | 0 in |
| Jaffrey Silver Ranch Airpark | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Ashuelot River Below Surry Mount Dam.
Boat launches
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River runs
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Nearby fishing
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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 Ashuelot River Below Surry Mount Dam in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Ashuelot River Below Surry Mount Dam crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Ashuelot River Below Surry Mount Dam
What is the Ashuelot River Below Surry Mount Dam flow rate right now?
As of July 26, 2026, Ashuelot River Below Surry Mount Dam is flowing at 18 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the Ashuelot River Below Surry Mount Dam running high or low right now?
Check the percent of median figure on this page: above 100% means Ashuelot River Below Surry Mount Dam is running higher than normal for the date, below 100% means lower. The 24-hour trend shows whether it's rising or falling.
Where does the streamflow data for Ashuelot River Below Surry Mount Dam come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 01158000. 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 Ashuelot River Below Surry Mount Dam 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 Ashuelot River Below Surry Mount Dam report
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