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Around Big Sioux River
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Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
Big Sioux River is a 62.1 mile river near Sodaks Marina in South Dakota. Streamflow is measured at the USGS gauge Big Sioux River near Jefferson, SD (site 06485910). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2015 to 2026
Big Sioux River typically runs highest in May, at a median 4,240 cfs, and lowest in February, at 727 cfs. The highest flow on record for any single day is 118,000 cfs, in 2024.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 768 | 433 to 1,690 |
| February | 727 | 405 to 1,290 |
| March | 1,670 | 811 to 4,770 |
| April | 3,055 | 1,110 to 6,790 |
| May | 4,240 | 1,720 to 6,090 |
| June | 3,460 | 1,345 to 5,730 |
| July | 2,570 | 1,160 to 5,160 |
| August | 1,390 | 599 to 2,990 |
| September | 1,125 | 740 to 2,405 |
| October | 860 | 567 to 3,940 |
| November | 1,165 | 641 to 2,590 |
| December | 1,040 | 508 to 2,320 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 11 years of record. Statistics published by the US Geological Survey for Big Sioux River near Jefferson, SD (site 06485910). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
8 mapped launches sit in the mapped area of Big Sioux River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Big Sioux River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
