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

Data from USGS & NOAA for informational purposes only. More

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