Big Sioux River Near Dell Rapids Flow Report
As of July 16, 2026, Big Sioux River Near Dell Rapids is flowing at 1,230 cfs with a gage height of 6.60 ft, rising 16% over the past 24 hours. Source: USGS gauge #06481000, refreshed throughout the day.
Historical Data
Big Sioux River Near Dell Rapids at a glance
How Big Sioux River Near Dell Rapids is running right now, where it sits on the map, and the key gauge stats.
Big Sioux River Near Dell Rapids is flowing at 1,230 cfs, with the water sitting 6.60 ft at the gage. Flow is up 16% since yesterday — a rising hydrograph.
This is USGS gauge #06481000 in South Dakota. Over the past 10 days the average has been 705 cfs, peaking at 1,230 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 #06481000).
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, Big Sioux R Near Dell Rapids Sd is expected to recede from today's 1230 cfs, toward roughly 1014 cfs by 2026-07-21 (likely range 227-4522 cfs) -- about normal for the date.
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.
Big Sioux River Near Dell Rapids
The main constituents of the river's flow come from snowmelt and precipitation. The river has several tributaries, including Skunk Creek and Split Rock Creek, which can impact its flow rates. There are no dams on this section of the river. Seasonal trends show increased flow during the spring and summer months, with low flow in the winter. Interestingly, the Big Sioux River was named after the Sioux Indian tribe and was a major transportation route during the fur trade era. Today, the river is used for recreational activities such as fishing and kayaking.
Nearby streamflow levels
Cross-check Big Sioux River Near Dell Rapids's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Big Sioux R Near Dell Rapids Sd | 1,230 cfs |
| Skunk Cr Nr Chester Sd | 0 cfs |
| Split Rock Cr At Corson Sd | 13 cfs |
| Big Sioux R At North Cliff Ave At Sioux Falls Sd | 1,070 cfs |
| Skunk Cr At Sioux Falls Sd | 9 cfs |
| Big Sioux R At Sioux Falls Sd | 209 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Big Sioux River Near Dell Rapids. 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 |
|---|---|
| Sioux Falls Nws Wfo Ap | 0 in |
| Sioux Falls | 0 in |
| Sioux Falls 5.5se Fsd Arpt | 0 in |
| Canton | 0 in |
| Brookings | 0 in |
| Mitchell-29mi.Ese | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Big Sioux River Near Dell Rapids.
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 Big Sioux River Near Dell Rapids in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Big Sioux River Near Dell Rapids crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Big Sioux River Near Dell Rapids
Where does the streamflow data for Big Sioux River Near Dell Rapids come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 06481000. 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 Big Sioux River Near Dell Rapids 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 Big Sioux River Near Dell Rapids report
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