Floyd River

Last Updated: May 10, 2026

Total streamflow across the Floyd River was last observed at 492 cfs, and is expected to yield approximately 976 acre-ft of water today; about 71% of normal. Average streamflow for this time of year is 693 cfs, with recent peaks last observed on 2018-09-21 when daily discharge volume was observed at 20,400 cfs.

Maximum discharge along the river is currently at the Floyd River At James reporting a streamflow rate of 395 cfs. This is also the highest stage along the Floyd River, with a gauge stage of 9.15 ft at this location. This river is monitored from 2 different streamgauging stations along the Floyd River, the highest being situated at an altitude of 1,289 ft, the Floyd River At Alton.

The Floyd River runs through Iowa and South Dakota, covering a length of 111 miles.


15-Day Long Term Forecast


River Details

Last Updated 2026-05-09
Discharge Volume 976 ACRE-FT
Streamflow 492.2 cfs
Past 24 Hours: -22.8 cfs (-4.43%)
Percent of Normal 71.04%
Maximum 20,400.0 cfs
2018-09-21
Seasonal Avg 693 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Floyd River At Alton
USGS 06600100
97 cfs 6.19 ft -8.3
Floyd River At James
USGS 06600500
395 cfs 9.15 ft -3.42
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Floyd River is a tributary of the Missouri River, 112 miles (180 km) long, in northwestern Iowa in the United States. It enters the Missouri at Sioux City, and is named for Charles Floyd, a member of the Lewis and Clark Expedition.