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River IA MN SD

Big Sioux River

Iowa • 42.9937, -96.5328
Length
418 mi
672 km
Elevation
2,017′ → 1,071′
946 ft drop
Stream Order
7
Large River
Slope
0.04%
2.3 ft/mi
Drainage
6,534 mi²
16,922 km²
Avg Flow
1,316 cfs
2.8 mph velocity
Path to Mouth
1,907 mi
3,069 km to ocean
Classification
Headwater
Source Stream
Elevation Profile
Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

EPA WQP MyWaterway
Data from USGS & NOAA for informational purposes only. More
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Water Level Gauges on Big Sioux River

There are 1 USGS water level monitoring stations on Big Sioux River providing real-time flow and stage data.

Access Sites on Big Sioux River

There are 31 boat ramps, launches, and public access points on Big Sioux River.