Sudbury River river
River streamflow levels
Daily aggregate streamflow across every monitored gauge along the Sudbury River. Use the range buttons to zoom in on a specific period.
Total streamflow
Sum of all monitored streamgauges · daily
Every streamgauge along the Sudbury River
All 1 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)▾ |
|---|---|---|---|---|---|---|---|
|
Sudbury River At Saxonville
MA
USGS 01098530
|
117 | 5.47 | -5.7 | 76% | 0 | 2,570 | 116 |
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
Sudbury River
The Sudbury River is a 32-mile-long river in Eastern Massachusetts that flows from its headwaters in Westborough through Sudbury, Wayland, and Concord before joining the Assabet River in Concord to form the Concord River. The river has a rich history, having been used by Native American tribes for fishing and hunting, and later by European settlers for agricultural purposes.
Several reservoirs and dams along the Sudbury River, including the Heard Pond Dam and the Moody Street Dam, have been installed over the years to control flooding and provide water for local communities. However, these structures have also had negative impacts on the river's ecology and have led to the degradation of its natural habitats.
Despite these challenges, the Sudbury River remains an important recreational resource for local communities, with activities such as fishing, canoeing, and hiking being popular among visitors. Additionally, a number of farms and agricultural operations rely on the river for irrigation and other purposes.
Recreation along the Sudbury River
Fishing access and paddle runs Snoflo tracks within the watershed.
Track the Sudbury 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 Sudbury River
Where does the data for the Sudbury 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.