Otter Brook Below Otter Brook Dam flow report
As of July 15, 2026, Otter Brook Below Otter Brook Dam is flowing at 12 cfs, holding steady over the past 24 hours. Source: USGS gauge #01158600, refreshed throughout the day.
Historical Data
Otter Brook Below Otter Brook Dam at a glance
How Otter Brook Below Otter Brook Dam is running right now, where it sits on the map, and the key gauge stats.
Otter Brook Below Otter Brook Dam is flowing at 12 cfs, with the water sitting 5.92 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #01158600 in New Hampshire. Over the past 10 days the average has been 17 cfs, peaking at 25 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.
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.
Otter Brook Below Otter Brook Dam
The brook is a tributary of the Souhegan River, and its flow is affected by the dam. The stream's flow is highest during the spring due to snowmelt and lower during the summer months. The brook is an important source of water for the town of Wilton, New Hampshire. The Otter Brook Dam is used to control water levels and to provide hydroelectric power to the surrounding area. Interesting fact: Otters, which are the namesake of the brook, are sometimes spotted in the area.
Nearby streamflow levels
Cross-check Otter Brook Below Otter Brook Dam's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Otter Brook Below Otter Brook Dam | 12 cfs |
| Ashuelot River Above The Branch | 21 cfs |
| Ashuelot River Below Surry Mt Dam | 17 cfs |
| S Br Ashuelot River At Webb | 25 cfs |
| Ashuelot River Near Gilsum | 13 cfs |
| Ashuelot River At West Swanzey | 95 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Otter Brook Below Otter Brook 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 |
| Edward Macdowell Lake | 0 in |
| Jaffrey Silver Ranch Airpark | 0 in |
| Hinsdale 2.5 Nnw | 0 in |
| Brattleboro 0.7 S | 0 in |
| Nohrsc Westminster 5.5 Nw | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Otter Brook Below Otter Brook 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 Otter Brook Below Otter Brook Dam in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Otter Brook Below Otter Brook Dam crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Otter Brook Below Otter Brook Dam
Where does the streamflow data for Otter Brook Below Otter Brook Dam come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 01158600. 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 Otter Brook Below Otter Brook 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 Otter Brook Below Otter Brook Dam report
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- Full history & forecasts — plus the free iPhone app