Iowa River Levels & Streamflow
As of Oct 14, 2026, Iowa rivers are running at 400% of normal across 116 USGS gauges — the highest is 28,500 cfs on the Mississippi River At Clinton. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Iowa.
Iowa river map
See Iowa’s rivers on a live map
Every gauge, river and reservoir, one tap each:
- Rivers now — which are running high or low
- Reservoirs — how full each one is vs normal
- Rain — past 24 hrs and the 72-hr forecast, press play
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Iowa river conditions today
Where rivers are running versus normal, what’s spiking and what’s coming — refreshed daily from USGS and NOAA.
Streamflow levels across Iowa are currently 400% of normal, with the Mississippi River At Clinton reporting the highest discharge in the state at 28,500 cfs and a gauge stage of 9.50 ft.
Meanwhile, the English Creek Near Knoxville is seeing a spike today — up 329% since yesterday and currently running near peak.
Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into Iowa's named rivers.
How Iowa’s rivers compare to normal
Every gauge placed by its own percent of normal, and three years of the statewide trend.
Where every gauge actually sits
One dot per Iowa streamgauge, placed by its own percent of normal. The state average is a single line through all of it.
Percent of normal compares today's discharge with the historical average for this calendar day. Tap any dot to open that gauge.
Iowa streamflow, three water years
Statewide percent of normal, every day since Oct 2023. The dotted line is normal.
799 daily readings from 116 reporting gauges. Percent of normal is today's statewide discharge against the historical average for the same calendar day — 100% is normal, not "good". The axis tops out at 250%: 60 readings above that — including the 1110% peak in Oct 2026 — are drawn along the top edge, so a few flood days cannot flatten three years of everything else. The line breaks in 2 places where the record skips more than five days — those are gaps in reporting, not readings of zero.
Iowa flow report
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Mississippi River At Clinton, Ia
7 hours ago · USGS 05420500 |
29,000 cfs | 9.38 ft | 67°F | 59°F | 593 ft | Copperas-Duck |
|
Des Moines River At Keosauqua, Ia
8 hours ago · USGS 05490500 |
25,400 cfs | 17.13 ft | 68°F | 60°F | 579 ft | Lower Des Moines |
|
Des Moines River At Ottumwa, Ia
7 hours ago · USGS 05489500 |
25,300 cfs | 8.90 ft | 68°F | 59°F | 635 ft | Lower Des Moines |
|
Des Moines River Near Tracy, Ia
8 hours ago · USGS 05488500 |
24,700 cfs | 9.80 ft | · | 56°F | 676 ft | Lower Des Moines |
|
Des Moines River Near Pella, Ia
8 hours ago · USGS 05488110 |
24,400 cfs | 93.77 ft | 68°F | 55°F | 689 ft | Lower Des Moines |
|
Iowa River At Wapello, Ia
7 hours ago · USGS 05465500 |
22,100 cfs | 18.07 ft | 49°F | 60°F | 554 ft | Lower Iowa |
|
Skunk River At Augusta, Ia
7 hours ago · USGS 05474000 |
11,500 cfs | 10.17 ft | · | 62°F | 553 ft | Skunk |
|
Des Moines River Blw Raccoon Riv At Des Moines, Ia
8 hours ago · USGS 05485500 |
11,200 cfs | 16.17 ft | · | 54°F | 779 ft | Lake Red Rock |
|
Cedar River Near Conesville, Ia
7 hours ago · USGS 05465000 |
10,800 cfs | 9.80 ft | · | 59°F | 593 ft | Lower Cedar |
|
Iowa River Near Lone Tree, Ia
7 hours ago · USGS 05455700 |
9,480 cfs | 12.08 ft | · | 59°F | 601 ft | Lower Iowa |
|
Iowa River At Iowa City, Ia
7 hours ago · USGS 05454500 |
8,480 cfs | 17.47 ft | · | 57°F | 643 ft | Lower Iowa |
|
Iowa River Below Coralville Dam Nr Coralville, Ia
7 hours ago · USGS 05453520 |
8,250 cfs | 54.81 ft | · | 57°F | 669 ft | Middle Iowa |
|
Cedar River At Cedar Rapids, Ia
7 hours ago · USGS 05464500 |
8,050 cfs | 5.77 ft | 62°F | 55°F | 712 ft | Middle Cedar |
|
Raccoon River At Fleur Drive, Ia
7 hours ago · USGS 05484900 |
6,540 cfs | 7.19 ft | · | 53°F | 797 ft | North Raccoon |
|
Raccoon River At 63rd Street At Des Moines, Ia
8 hours ago · USGS 05484650 |
6,460 cfs | 25.68 ft | · | 54°F | 797 ft | North Raccoon |
|
Des Moines River At 2nd Avenue, Ia
8 hours ago · USGS 05482000 |
5,720 cfs | 16.58 ft | 32°F | 54°F | 808 ft | Middle Des Moines |
|
Raccoon River At Van Meter, Ia
8 hours ago · USGS 05484500 |
5,460 cfs | 7.38 ft | 32°F | 53°F | 862 ft | North Raccoon |
|
Iowa River At Marengo, Ia
7 hours ago · USGS 05453100 |
4,730 cfs | 12.18 ft | · | 55°F | 729 ft | Middle Iowa |
|
Cedar River At Waterloo, Ia
7 hours ago · USGS 05464000 |
4,690 cfs | 6.87 ft | · | 52°F | 823 ft | Middle Cedar |
|
South Skunk River Near Oskaloosa, Ia
7 hours ago · USGS 05471500 |
4,680 cfs | 15.88 ft | · | 56°F | 692 ft | South Skunk |
|
Des Moines River Near Saylorville, Ia
8 hours ago · USGS 05481650 |
4,300 cfs | 6.12 ft | · | 53°F | 819 ft | Middle Des Moines |
|
Cedar River At Cedar Falls, Ia
7 hours ago · USGS 05463050 |
4,160 cfs | 78.70 ft | · | 52°F | 853 ft | Middle Cedar |
|
Wapsipinicon River Near De Witt, Ia
7 hours ago · USGS 05422000 |
4,090 cfs | 9.67 ft | · | 58°F | 646 ft | Lower Wapsipinicon |
|
Iowa River Near Belle Plaine, Ia
7 hours ago · USGS 05452500 |
3,760 cfs | 11.71 ft | · | 54°F | 748 ft | Middle Iowa |
|
Des Moines River Near Stratford, Ia
8 hours ago · USGS 05481300 |
3,310 cfs | 7.53 ft | · | 49°F | 902 ft | Middle Des Moines |
|
Nishnabotna River Above Hamburg, Ia
7 hours ago · USGS 06810000 |
2,960 cfs | 12.58 ft | · | 54°F | 904 ft | Nishnabotna |
|
Turkey River At Garber, Ia
8 hours ago · USGS 05412500 |
2,220 cfs | 8.51 ft | 65°F | 52°F | 646 ft | Turkey |
|
Wapsipinicon River Near Anamosa, Ia
8 hours ago · USGS 05421740 |
2,130 cfs | 7.72 ft | · | 55°F | 779 ft | Lower Wapsipinicon |
|
North Raccoon River Near Jefferson, Ia
8 hours ago · USGS 05482500 |
2,030 cfs | 7.44 ft | 37°F | 50°F | 978 ft | North Raccoon |
|
South Skunk River At Colfax, Ia
7 hours ago · USGS 05471050 |
2,000 cfs | 11.40 ft | · | 54°F | 793 ft | South Skunk |
|
Maquoketa River Near Maquoketa, Ia
8 hours ago · USGS 05418500 |
1,860 cfs | 12.59 ft | · | 56°F | 646 ft | Maquoketa |
|
West Nishnabotna River At Randolph, Ia
7 hours ago · USGS 06808500 |
1,850 cfs | 10.33 ft | 62°F | 53°F | 956 ft | West Nishnabotna |
|
Iowa River At Marshalltown, Ia
7 hours ago · USGS 05451500 |
1,770 cfs | 12.53 ft | · | 52°F | 853 ft | Middle Iowa |
|
Cedar River At Janesville, Ia
7 hours ago · USGS 05458500 |
1,540 cfs | 2.38 ft | · | 51°F | 859 ft | Upper Cedar |
|
Des Moines River At Fort Dodge, Ia
8 hours ago · USGS 05480500 |
1,440 cfs | 4.60 ft | · | 47°F | 974 ft | Middle Des Moines |
|
North Skunk River Near Sigourney, Ia
7 hours ago · USGS 05472500 |
1,300 cfs | 8.87 ft | · | 57°F | 664 ft | North Skunk |
|
Cedar River At Waverly, Ia
8 hours ago · USGS 05458300 |
1,230 cfs | 4.70 ft | 65°F | 50°F | 895 ft | Upper Cedar |
|
South Skunk River Below Squaw Creek Near Ames, Ia
7 hours ago · USGS 05471000 |
1,150 cfs | 13.51 ft | · | 51°F | 872 ft | South Skunk |
|
Shell Rock River At Shell Rock, Ia
7 hours ago · USGS 05462000 |
1,150 cfs | 8.52 ft | · | 50°F | 882 ft | Shell Rock |
|
Wapsipinicon River At Independence, Ia
7 hours ago · USGS 05421000 |
1,100 cfs | 5.85 ft | · | 52°F | 889 ft | Upper Wapsipinicon |
|
Turkey River Above French Hollow Cr At Elkader, Ia
7 hours ago · USGS 05412020 |
998 cfs | 6.58 ft | · | 51°F | 726 ft | Turkey |
|
Little Sioux River Near Turin, Ia
7 hours ago · USGS 06607500 |
982 cfs | 7.99 ft | · | 45°F | 1,029 ft | Little Sioux |
|
South Raccoon River At Redfield, Ia
7 hours ago · USGS 05484000 |
892 cfs | 3.97 ft | 32°F | 52°F | 917 ft | South Raccoon |
|
Beaver Creek Near Grimes, Ia
8 hours ago · USGS 05481950 |
869 cfs | 6.45 ft | · | 53°F | 829 ft | Middle Des Moines |
|
Big Sioux River At Akron, Ia
7 hours ago · USGS 06485500 |
830 cfs | 5.61 ft | · | 44°F | 1,151 ft | Lower Big Sioux |
|
English River At Kalona, Ia
7 hours ago · USGS 05455500 |
808 cfs | 6.86 ft | · | 58°F | 655 ft | Lower Iowa |
|
West Fork Cedar River At Finchford, Ia
7 hours ago · USGS 05458900 |
776 cfs | 8.14 ft | · | 51°F | 859 ft | West Fork Cedar |
|
West Nishnabotna River At Hancock, Ia
7 hours ago · USGS 06807410 |
694 cfs | 3.87 ft | · | 49°F | 1,089 ft | West Nishnabotna |
|
Upper Iowa River Near Dorchester, Ia
8 hours ago · USGS 05388250 |
693 cfs | 7.59 ft | · | 48°F | 668 ft | Upper Iowa |
|
Cedar River At Charles City, Ia
7 hours ago · USGS 05457700 |
627 cfs | 2.92 ft | · | 47°F | 977 ft | Upper Cedar |
|
Chariton River Near Moulton, Ia
7 hours ago · USGS 06904010 |
622 cfs | 22.05 ft | · | 61°F | 847 ft | Upper Chariton |
|
Chariton River Near Rathbun, Ia
7 hours ago · USGS 06903900 |
614 cfs | 5.26 ft | · | 57°F | 855 ft | Upper Chariton |
|
Little Sioux River At Correctionville, Ia
7 hours ago · USGS 06606600 |
612 cfs | 5.43 ft | · | 45°F | 1,106 ft | Little Sioux |
|
Turkey River Near Eldorado, Ia
7 hours ago · USGS 05411850 |
592 cfs | 6.26 ft | · | 49°F | 897 ft | Turkey |
|
Black Hawk Creek At Hudson, Ia
7 hours ago · USGS 05463500 |
585 cfs | 8.60 ft | · | 52°F | 897 ft | Middle Cedar |
|
Nodaway River At Clarinda, Ia
8 hours ago · USGS 06817000 |
580 cfs | 11.25 ft | · | 54°F | 966 ft | West Nodaway |
|
Squaw Creek At Ames, Ia
7 hours ago · USGS 05470500 |
578 cfs | 2.98 ft | · | 51°F | 907 ft | South Skunk |
|
South Skunk River Near Ames, Ia
7 hours ago · USGS 05470000 |
568 cfs | 5.19 ft | · | 51°F | 928 ft | South Skunk |
|
Beaver Creek At New Hartford, Ia
7 hours ago · USGS 05463000 |
533 cfs | 4.38 ft | · | 53°F | 890 ft | Middle Cedar |
|
North Fork Maquoketa River Near Fulton, Ia
8 hours ago · USGS 05418400 |
528 cfs | 3.91 ft | 39°F | 55°F | 689 ft | Maquoketa |
|
Rock River Near Rock Valley, Ia
7 hours ago · USGS 06483500 |
527 cfs | 5.27 ft | · | 44°F | 1,238 ft | Rock |
|
East Nishnabotna River At Red Oak, Ia
7 hours ago · USGS 06809500 |
521 cfs | 8.02 ft | · | 52°F | 1,013 ft | East Nishnabotna |
|
Middle River Near Indianola, Ia
8 hours ago · USGS 05486490 |
518 cfs | 9.07 ft | · | 55°F | 794 ft | Lake Red Rock |
|
Indian Creek Near Mingo, Ia
8 hours ago · USGS 05471200 |
510 cfs | 5.48 ft | · | 53°F | 827 ft | South Skunk |
|
Des Moines River At Humboldt, Ia
7 hours ago · USGS 05476750 |
494 cfs | 3.95 ft | · | 46°F | 1,066 ft | Upper Des Moines |
|
Wolf Creek Near Dysart, Ia
8 hours ago · USGS 05464220 |
493 cfs | 3.81 ft | · | 53°F | 835 ft | Middle Cedar |
|
Boone River Near Webster City, Ia
8 hours ago · USGS 05481000 |
471 cfs | 3.07 ft | 35°F | 48°F | 1,028 ft | Boone |
|
Boyer River At Logan, Ia
7 hours ago · USGS 06609500 |
469 cfs | 4.51 ft | · | 47°F | 1,014 ft | Boyer |
|
Upper Iowa River At Decorah, Ia
7 hours ago · USGS 05387500 |
466 cfs | 2.18 ft | · | 48°F | 854 ft | Upper Iowa |
|
East Nishnabotna River Near Atlantic, Ia
7 hours ago · USGS 06809210 |
453 cfs | 4.11 ft | · | 50°F | 1,109 ft | East Nishnabotna |
|
Volga River At Littleport, Ia
7 hours ago · USGS 05412400 |
447 cfs | 5.67 ft | · | 52°F | 694 ft | Turkey |
|
North Raccoon River Near Sac City, Ia
8 hours ago · USGS 05482300 |
408 cfs | 8.51 ft | 75°F | 47°F | 1,179 ft | North Raccoon |
|
East Fork Des Moines River At Dakota City, Ia
8 hours ago · USGS 05479000 |
404 cfs | 8.64 ft | · | 46°F | 1,043 ft | East Fork Des Moines |
|
North River Near Norwalk, Ia
8 hours ago · USGS 05486000 |
396 cfs | 8.80 ft | · | 54°F | 811 ft | Lake Red Rock |
|
South Fork Iowa River Ne Of New Providence, Ia
7 hours ago · USGS 05451210 |
388 cfs | 4.69 ft | · | 50°F | 963 ft | Upper Iowa |
|
Middle Raccoon River Near Bayard, Ia
8 hours ago · USGS 05483450 |
385 cfs | 11.12 ft | · | 49°F | 1,054 ft | South Raccoon |
|
Maquoketa River At Manchester, Ia
8 hours ago · USGS 05416900 |
363 cfs | 5.03 ft | · | 52°F | 920 ft | Maquoketa |
|
Thompson River At Davis City, Ia
8 hours ago · USGS 06898000 |
357 cfs | 1.91 ft | · | 56°F | 910 ft | Thompson |
|
Cedar Creek Near Oakland Mills, Ia
7 hours ago · USGS 05473400 |
344 cfs | 5.35 ft | · | 59°F | 590 ft | Skunk |
|
Middle Raccoon River At Panora, Ia
8 hours ago · USGS 05483600 |
322 cfs | 4.96 ft | 35°F | 50°F | 997 ft | South Raccoon |
|
Salt Creek Near Elberon, Ia
7 hours ago · USGS 05452000 |
318 cfs | 7.80 ft | · | 54°F | 802 ft | Middle Iowa |
|
Upper Iowa River At Bluffton, Ia
7 hours ago · USGS 05387440 |
317 cfs | 3.68 ft | · | 47°F | 970 ft | Upper Iowa |
|
Little Sioux River At Linn Grove, Ia
7 hours ago · USGS 06605850 |
288 cfs | 5.78 ft | · | 45°F | 1,249 ft | Little Sioux |
|
Big Bear Creek At Ladora, Ia
7 hours ago · USGS 05453000 |
259 cfs | 12.29 ft | · | 55°F | 771 ft | Middle Iowa |
|
Maple River At Mapleton, Ia
7 hours ago · USGS 06607200 |
256 cfs | 5.00 ft | · | 45°F | 1,114 ft | Maple |
|
Floyd River At James, Ia
7 hours ago · USGS 06600500 |
255 cfs | 8.66 ft | · | 45°F | 1,117 ft | Floyd |
|
Wapsipinicon River Near Tripoli, Ia
7 hours ago · USGS 05420680 |
246 cfs | 8.50 ft | · | 50°F | 1,019 ft | Upper Wapsipinicon |
|
Yellow River At Ion, Ia
7 hours ago · USGS 05389000 |
223 cfs | 6.24 ft | · | 50°F | 681 ft | Coon-Yellow |
|
Old Mans Creek Near Iowa City, Ia
7 hours ago · USGS 05455100 |
215 cfs | 3.61 ft | 46°F | 57°F | 654 ft | Lower Iowa |
|
Turkey River At Spillville, Ia
7 hours ago · USGS 05411600 |
205 cfs | 2.74 ft | · | 48°F | 1,067 ft | Turkey |
|
Winnebago River At Mason City, Ia
7 hours ago · USGS 05459500 |
196 cfs | 4.99 ft | · | 45°F | 1,101 ft | Winnebago |
|
Fourmile Creek At Des Moines, Ia
7 hours ago · USGS 05485640 |
185 cfs | 4.34 ft | · | 54°F | 813 ft | Lake Red Rock |
|
Little Cedar River Near Ionia, Ia
7 hours ago · USGS 05458000 |
165 cfs | 4.01 ft | · | 48°F | 1,000 ft | Upper Cedar |
|
Cedar Creek Near Bussey, Ia
8 hours ago · USGS 05489000 |
156 cfs | 5.40 ft | · | 56°F | 696 ft | Lower Des Moines |
|
Timber Creek Near Marshalltown, Ia
7 hours ago · USGS 05451700 |
153 cfs | 3.92 ft | · | 52°F | 862 ft | Middle Iowa |
|
South River Near Ackworth, Ia
8 hours ago · USGS 05487470 |
150 cfs | 5.86 ft | · | 55°F | 805 ft | Lake Red Rock |
|
Clear Creek Near Coralville, Ia
7 hours ago · USGS 05454300 |
131 cfs | 2.02 ft | · | 57°F | 660 ft | Lower Iowa |
|
Monona-Harrison Ditch Near Turin, Ia
7 hours ago · USGS 06602400 |
130 cfs | 4.73 ft | · | 45°F | 1,021 ft | Monona-Harrison Ditch |
|
Soldier River At Pisgah, Ia
7 hours ago · USGS 06608500 |
121 cfs | 3.02 ft | · | 46°F | 1,047 ft | Blackbird-Soldier |
|
Ocheyedan River Near Spencer, Ia
7 hours ago · USGS 06605000 |
110 cfs | 2.61 ft | · | 45°F | 1,317 ft | Little Sioux |
|
Walnut Creek At Des Moines, Ia
7 hours ago · USGS 05484800 |
107 cfs | 3.95 ft | · | 53°F | 808 ft | North Raccoon |
|
Fourmile Creek Near Ankeny, Ia
8 hours ago · USGS 05485605 |
103 cfs | 2.66 ft | · | 53°F | 911 ft | Lake Red Rock |
|
Clear Creek Near Oxford, Ia
7 hours ago · USGS 05454220 |
100 cfs | 3.13 ft | · | 57°F | 722 ft | Lower Iowa |
|
Richland Creek Near Haven, Ia
7 hours ago · USGS 05451900 |
91 cfs | 11.68 ft | · | 54°F | 817 ft | Middle Iowa |
|
Rock River Below Tom Creek At Rock Rapids, Ia
8 hours ago · USGS 06483290 |
83 cfs | 7.17 ft | · | 44°F | 1,316 ft | Rock |
|
White Breast Creek Near Dallas, Ia
8 hours ago · USGS 05487980 |
80 cfs | 6.58 ft | · | 55°F | 773 ft | Lake Red Rock |
|
Walnut Creek Near Hartwick, Ia
7 hours ago · USGS 05452200 |
79 cfs | 2.44 ft | · | 57°F | 806 ft | Middle Iowa |
|
Iowa River Near Rowan, Ia
7 hours ago · USGS 05449500 |
79 cfs | 3.86 ft | · | 46°F | 1,187 ft | Upper Iowa |
|
Floyd River At Alton, Ia
7 hours ago · USGS 06600100 |
56 cfs | 5.73 ft | · | 47°F | 1,289 ft | Floyd |
|
Rapid Creek Near Iowa City, Ia
8 hours ago · USGS 05454000 |
50 cfs | 4.40 ft | · | 57°F | 688 ft | Lower Iowa |
|
Big Creek Near Mt. Pleasant, Ia
7 hours ago · USGS 05473450 |
50 cfs | 4.02 ft | · | 59°F | 672 ft | Skunk |
|
English Creek Near Knoxville, Ia
8 hours ago · USGS 05488200 |
29 cfs | 8.80 ft | · | 56°F | 749 ft | Lower Des Moines |
|
Bloody Run Creek Near Marquette, Ia
7 hours ago · USGS 05389400 |
24 cfs | 4.12 ft | · | 51°F | 634 ft | Coon-Yellow |
|
East Fork 102 River At Bedford, Ia
7 hours ago · USGS 06819185 |
19 cfs | 10.99 ft | · | 54°F | 1,084 ft | One Hundred And Two |
|
South Fork Chariton River Near Promise City, Ia
7 hours ago · USGS 06903700 |
17 cfs | 3.21 ft | · | 56°F | 922 ft | Upper Chariton |
|
Chariton River Near Chariton, Ia
7 hours ago · USGS 06903400 |
15 cfs | 4.75 ft | · | 55°F | 968 ft | Upper Chariton |
About Iowa streamflow
What are river levels like in Iowa right now?
As of October 14, 2026, Iowa rivers are running at 400% of normal across 116 USGS streamgauges, and the Mississippi River At Clinton is reporting the highest discharge at 28,500 cfs. The full sortable gauge table is below.
Which Iowa river is running highest right now?
As of October 14, 2026, the highest discharge in Iowa is 28,500 cfs on the Mississippi River At Clinton. See the sortable gauge table for the full statewide ranking.
Are Iowa rivers high or low right now?
Compare the statewide percent-of-normal on this page: above 100% means Iowa rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.
Where does the Iowa streamflow data come from?
The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.
What is cfs?
Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.
What does Gauge Height mean?
The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").
How fresh is the Iowa data?
USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.
Can I get a flow alert for a Iowa gauge?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.
Is this a substitute for an NWS flood warning?
No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.