Castle Creek Below Deerfield Dam Flow Report
As of July 25, 2026, Castle Creek Below Deerfield Dam is flowing at 10 cfs with a gage height of 3.49 ft, holding steady over the past 24 hours. Source: USGS gauge #06410000, refreshed throughout the day.
Historical Data
Castle Creek Below Deerfield Dam at a glance
How Castle Creek Below Deerfield Dam is running right now, where it sits on the map, and the key gauge stats.
Castle Creek Below Deerfield Dam is flowing at 10 cfs, with the water sitting 3.49 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #06410000 in South Dakota. Over the past 10 days the average has been 11 cfs, peaking at 11 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the South Dakota flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #06410000).
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, Castle Cr Below Deerfield Dam Sd is expected to hold near today's 10 cfs, toward roughly 10 cfs by 2026-07-30 (likely range 6-17 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.
Castle Creek Below Deerfield Dam
The water flow is primarily provided by Castle Creek, which receives water from a few small unnamed tributaries. The Deerfield Dam, which impounds the Deerfield Reservoir, may also contribute to the flow. Seasonal trends show higher flows in the spring due to snowmelt, while lower flows are observed in the summer and fall. Interestingly, the Castle Creek gauge is known for having high variability in flow, with frequent changes in water levels. Overall, the hydrology of the Castle Creek gauge is influenced by natural and human factors, making it an interesting site for study.
Nearby streamflow levels
Cross-check Castle Creek Below Deerfield Dam's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Castle Creek Below Deerfield Dam Sd | 10 cfs |
| Castle Creek Above Deerfield Reservoir Near Hill City Sd | 9 cfs |
| Rhoads Fork Near Rochford Sd | 5 cfs |
| Rapid Creek Above Pactola Reservoir At Silver City | 20 cfs |
| Beaver Creek At Mallo Camp | 3 cfs |
| Rapid Creek Below Pactola Dam Sd | 59 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Castle Creek Below Deerfield 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 |
|---|---|
| Nohrsc Blind Park (Snotel) | — |
| Blind Park | 0 in |
| Hill City | 0 in |
| Nohrsc North Rapid Creek (Snotel) | 0 in |
| North Rapid Creek | 0 in |
| Lead 5.5 Ssw | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Castle Creek Below Deerfield Dam.
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 Castle Creek Below Deerfield Dam in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Castle Creek Below Deerfield Dam crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Castle Creek Below Deerfield Dam
What is the Castle Creek Below Deerfield Dam flow rate right now?
As of July 25, 2026, Castle Creek Below Deerfield Dam is flowing at 10 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the Castle Creek Below Deerfield Dam running high or low right now?
Check the percent of median figure on this page: above 100% means Castle Creek Below Deerfield 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 Castle Creek Below Deerfield Dam come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 06410000. 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 Castle Creek Below Deerfield 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 Castle Creek Below Deerfield Dam report
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