South Dakota · river
Big Sioux River near Jefferson
Live conditions for this USGS-monitored stretch of water, updated every 15 minutes.
Caution
Paddle Score, from live wind and water conditions
Wind
19 mph
gusting to 32 mph
Air temp
73°F
50% chance of rain
River flow
397 cfs
low for this date
Best day to paddle this week
Wednesday · 80
Today
33
91°
Sun
19
80°
Mon
0
102°
Tue
14
95°
Wed
80
90°
Best
Thu
65
92°
Fri
53
87°
Scored from each day's peak forecast wind, heat, and rain chance — river flow isn't forecastable, so check back before you load the boat.
Wind, next 12 hours
mph| Hour | Wind (mph) | Gusts (mph) |
|---|---|---|
| 10a | 16 | 31 |
| 11a | 11 | 20 |
| 12p | 19 | 30 |
| 1p | 19 | 33 |
| 2p | 14 | 29 |
| 3p | 15 | 26 |
| 4p | 11 | 17 |
| 5p | 10 | 14 |
| 6p | 8 | 12 |
| 7p | 7 | 13 |
| 8p | 8 | 13 |
| 9p | 9 | 16 |
Is this flow normal for September 5?
Today's 397 cfs is 67% below the median for this date — which counts as low water here.
The median flow on this date is 1,220 cfs, across 10 years of USGS record at this gauge. Whether that is runnable depends on the stretch — this is context, not a recommendation.
Why this score
- Wind — 19 mph — stay off open water-48
- Gusts — Gusting to 32 mph — 13 mph over sustained-6
- Rain — 50% chance in the next 6 hours-8
We don't have launch notes for this one
This page is built from the USGS gauge at this location, so the flow and weather are real — but we haven't verified where to put in, what the hazards are, or whether this stretch is legal or sensible to paddle. We'd rather say that than invent it. The links below are where to find out.
We also don't have a verified safe-flow range here, so the Paddle Score reflects weather only. Judge the flow number against local knowledge, not against our score.
Do your own homework
We show you live conditions. For local knowledge — where to put in, what the hazards are, whether it's worth the drive — here's where paddlers actually talk about this water. We don't vet these sources; check the dates and judge for yourself.
- Paddler discussion on Reddit
Trip reports and local warnings, straight from the source
- Search American Whitewater
Rapid classifications and gauge-linked run descriptions
- Satellite view and access roads
Check parking, put-ins, and what the banks actually look like
- Video from this water
The fastest way to see the character of a run before you drive
- USGS gauge 06485910
Full hydrograph, historical flows, and station metadata