Ashuelot River Flow
As of 2026-08-05, the Ashuelot River is flowing at a combined 2,762 cfs across 5 USGS streamgauges — 209% of normal for this time of year, versus a seasonal average of 1,322 cfs.
Total streamflow across the Ashuelot River was last observed at 2,762 cfs, and is expected to yield approximately 5,478 acre-ft of water today; about 209% of normal. River levels are high. Average streamflow for this time of year is 1,322 cfs, with recent peaks last observed on 2021-07-20 when daily discharge volume was observed at 11,380 cfs.
Maximum discharge along the river is currently at the Ashuelot River At Hinsdale reporting a streamflow rate of 1,360 cfs. However, the streamgauge with the highest stage along the river is the Ashuelot River Above The Branch with a gauge stage of 66.91 ft. This river is monitored from 5 different streamgauging stations along the Ashuelot River, the highest being situated at an altitude of 810 ft, the Ashuelot River Near Gilsum.
River streamflow levels
Daily aggregate streamflow across every monitored gauge along the Ashuelot River. Use the range buttons to zoom in on a specific period.
Total streamflow
Sum of all monitored streamgauges · daily
Every streamgauge along the Ashuelot River
All 5 USGS gauges Snoflo tracks for this river, with current flow, stage, recent change, percent of normal, and the gauge's all-time min / max. Click any header to sort. Cells are heatmapped relative to the column min/max -- darker blue = higher.
| Streamgauge▾ | Streamflow (cfs)▾ | Gauge stage (ft)▾ | 24h Δ (%)▾ | % Normal▾ | Min (cfs)▾ | Max (cfs)▾ | Elevation (ft)▾ |
|---|---|---|---|---|---|---|---|
|
Ashuelot River Near Gilsum
NH
USGS 01157000
|
87 | 2.70 | -20.4 | 479% | 2 | 6,840 | 810 |
|
Ashuelot River Below Surry Mt Dam
NH
USGS 01158000
|
105 | 5.62 | 21.0 | 386% | 0 | 1,210 | 502 |
|
Ashuelot River Above The Branch
NH
USGS 01158110
|
21 | 66.91 | -43.4 | 23% | 0 | 1,260 | 476 |
|
Ashuelot River At West Swanzey
NH
USGS 01160350
|
1,210 | 7.92 | 22.6 | 1233% | 18 | 4,080 | 456 |
|
Ashuelot River At Hinsdale
NH
USGS 01161000
|
1,360 | 5.44 | 27.1 | 951% | 27 | 6,940 | 205 |
Maximum streamflow discharge by year
The single highest aggregate discharge recorded each year. Spotting the multi-year trend reveals droughts vs. wet cycles long before the headline daily flow does.
Annual peak discharge
From the river's full record · one point per water year
Streamflow elevation profile
Each bubble is one gauge along the river, plotted by current streamflow (x-axis) vs elevation (y-axis), sized by gauge stage. Reading top-to-bottom traces the river from headwaters down to its mouth -- you can see flow accumulate as elevation drops.
Elevation vs streamflow
One point per monitored gauge · bubble size = gauge stage
Ashuelot River
The Ashuelot River is a 64-mile-long river in southwestern New Hampshire. The river flows through several towns, including Ashuelot, Winchester, Hinsdale, and Swanzey. The river's hydrology is largely influenced by the many dams and reservoirs along its length. The two largest reservoirs are the Highland Lake and the Surry Mountain Lake. The river has historically been used for water-powered mills, and today it is used for hydroelectric power generation. Additionally, the river provides opportunities for recreational activities such as fishing, canoeing, and kayaking. The river is also used for agricultural irrigation in some areas. The Ashuelot River is an important natural resource for the region and is home to a variety of fish species, including trout, smallmouth bass, and walleye.
Recreation along the Ashuelot River
Fishing access and paddle runs Snoflo tracks within the watershed.
Track the Ashuelot River in the Snoflo app
Set per-gauge push alerts (e.g. "alert me when flow at the Russian R Nr Healdsburg crosses 5,000 cfs"), and Snoflo's iOS app pushes the moment USGS reports the crossing.
About the Ashuelot River
How is the Ashuelot River flowing right now?
As of 2026-08-05, the Ashuelot River is flowing at a combined 2,762 cfs across its USGS streamgauges, about 209% of normal for this date. The live per-gauge breakdown and 24-hour trend are shown above.
Is the Ashuelot River running high or low right now?
Check the percent-of-normal figure on this page: above 100% means the river is running higher than its seasonal average for the date, below 100% means lower. The per-gauge table shows which reaches are highest and lowest.
Where does the data for the Ashuelot River come from?
Streamflow and gauge stage data are sourced from the U.S. Geological Survey (USGS) National Water Information System. The aggregate flow shown at the top of the page is computed by Snoflo as the sum of all monitored gauges along the river.
How is "percent of normal" calculated?
Today's aggregate streamflow is compared to the historical average aggregate streamflow on this calendar day across the river's full record. 100% means right on average; values above 100% indicate above-normal flow (wet year); values below indicate below-normal (dry year or drought).
Why are some gauges showing very different flows?
Gauges along a river measure flow at different points: headwater gauges read what's coming off the snowpack or mountain runoff; downstream gauges integrate everything upstream, including tributary inputs. Wide spreads usually mean a tributary is contributing significantly between gauges.
What's the elevation profile chart showing?
Each bubble is one gauge along the river, plotted by streamflow (x-axis) and elevation (y-axis), sized by gauge stage. Reading top-down traces the river from headwaters to mouth -- you can see flow build as elevation drops.
Can I get alerts when a specific gauge crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app on a per-gauge basis. Open any individual streamgauge from the table above and favorite it to set a discharge threshold.