Iowa River Levels & Streamflow
As of Oct 22, 2026, Iowa rivers are running at 361% of normal across 116 USGS gauges — the highest is 34,800 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 361% of normal, with the Mississippi River At Clinton reporting the highest discharge in the state at 34,800 cfs and a gauge stage of 9.55 ft.
Meanwhile, the Iowa River At Wapello is seeing a spike today — up 6% 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%: 68 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
8 hours ago · USGS 05420500 |
33,100 cfs | 9.51 ft | 59°F | 44°F | 593 ft | Copperas-Duck |
|
Des Moines River At Keosauqua, Ia
8 hours ago · USGS 05490500 |
17,400 cfs | 15.27 ft | 60°F | 48°F | 579 ft | Lower Des Moines |
|
Iowa River At Wapello, Ia
8 hours ago · USGS 05465500 |
16,900 cfs | 16.82 ft | 49°F | 48°F | 554 ft | Lower Iowa |
|
Des Moines River Near Pella, Ia
8 hours ago · USGS 05488110 |
16,800 cfs | 91.23 ft | 59°F | 54°F | 689 ft | Lower Des Moines |
|
Des Moines River Near Tracy, Ia
8 hours ago · USGS 05488500 |
16,700 cfs | 7.61 ft | · | 51°F | 676 ft | Lower Des Moines |
|
Des Moines River At Ottumwa, Ia
8 hours ago · USGS 05489500 |
16,100 cfs | 6.35 ft | 60°F | 51°F | 635 ft | Lower Des Moines |
|
Cedar River Near Conesville, Ia
8 hours ago · USGS 05465000 |
10,800 cfs | 9.81 ft | · | 47°F | 593 ft | Lower Cedar |
|
Des Moines River Blw Raccoon Riv At Des Moines, Ia
8 hours ago · USGS 05485500 |
10,000 cfs | 15.72 ft | · | 55°F | 779 ft | Lake Red Rock |
|
Cedar River At Cedar Rapids, Ia
8 hours ago · USGS 05464500 |
8,830 cfs | 6.00 ft | 62°F | 46°F | 712 ft | Middle Cedar |
|
Skunk River At Augusta, Ia
9 hours ago · USGS 05474000 |
6,260 cfs | 6.95 ft | · | 47°F | 553 ft | Skunk |
|
Cedar River At Waterloo, Ia
8 hours ago · USGS 05464000 |
5,860 cfs | 7.21 ft | · | 50°F | 823 ft | Middle Cedar |
|
Iowa River Near Lone Tree, Ia
8 hours ago · USGS 05455700 |
5,810 cfs | 9.64 ft | · | 47°F | 601 ft | Lower Iowa |
|
Raccoon River At Fleur Drive, Ia
9 hours ago · USGS 05484900 |
5,570 cfs | 6.46 ft | · | 53°F | 797 ft | North Raccoon |
|
Raccoon River At 63rd Street At Des Moines, Ia
8 hours ago · USGS 05484650 |
5,550 cfs | 25.04 ft | · | 55°F | 797 ft | North Raccoon |
|
Des Moines River At 2nd Avenue, Ia
8 hours ago · USGS 05482000 |
5,200 cfs | 16.66 ft | 32°F | 53°F | 808 ft | Middle Des Moines |
|
Iowa River Below Coralville Dam Nr Coralville, Ia
8 hours ago · USGS 05453520 |
4,980 cfs | 52.83 ft | · | 47°F | 669 ft | Middle Iowa |
|
Cedar River At Cedar Falls, Ia
9 hours ago · USGS 05463050 |
4,880 cfs | 78.70 ft | · | 49°F | 853 ft | Middle Cedar |
|
Raccoon River At Van Meter, Ia
8 hours ago · USGS 05484500 |
4,810 cfs | 6.94 ft | 32°F | 52°F | 862 ft | North Raccoon |
|
Iowa River At Iowa City, Ia
8 hours ago · USGS 05454500 |
4,340 cfs | 14.51 ft | · | 47°F | 643 ft | Lower Iowa |
|
Wapsipinicon River Near De Witt, Ia
8 hours ago · USGS 05422000 |
4,040 cfs | 9.63 ft | · | 45°F | 646 ft | Lower Wapsipinicon |
|
Des Moines River Near Saylorville, Ia
8 hours ago · USGS 05481650 |
3,960 cfs | 6.26 ft | · | 52°F | 819 ft | Middle Des Moines |
|
Iowa River At Marengo, Ia
8 hours ago · USGS 05453100 |
3,930 cfs | 11.33 ft | · | 47°F | 729 ft | Middle Iowa |
|
Des Moines River Near Stratford, Ia
8 hours ago · USGS 05481300 |
3,670 cfs | 7.83 ft | · | 51°F | 902 ft | Middle Des Moines |
|
Iowa River Near Belle Plaine, Ia
8 hours ago · USGS 05452500 |
3,360 cfs | 11.19 ft | · | 47°F | 748 ft | Middle Iowa |
|
South Skunk River Near Oskaloosa, Ia
8 hours ago · USGS 05471500 |
3,080 cfs | 13.80 ft | · | 51°F | 692 ft | South Skunk |
|
Nishnabotna River Above Hamburg, Ia
8 hours ago · USGS 06810000 |
2,760 cfs | 12.30 ft | · | 53°F | 904 ft | Nishnabotna |
|
Wapsipinicon River Near Anamosa, Ia
8 hours ago · USGS 05421740 |
2,630 cfs | 8.39 ft | · | 46°F | 779 ft | Lower Wapsipinicon |
|
Turkey River At Garber, Ia
8 hours ago · USGS 05412500 |
2,190 cfs | 8.48 ft | 55°F | 47°F | 646 ft | Turkey |
|
Cedar River At Janesville, Ia
9 hours ago · USGS 05458500 |
1,900 cfs | 2.71 ft | · | 49°F | 859 ft | Upper Cedar |
|
North Raccoon River Near Jefferson, Ia
8 hours ago · USGS 05482500 |
1,840 cfs | 7.25 ft | 37°F | 53°F | 978 ft | North Raccoon |
|
Maquoketa River Near Maquoketa, Ia
8 hours ago · USGS 05418500 |
1,800 cfs | 12.51 ft | · | 45°F | 646 ft | Maquoketa |
|
Des Moines River At Fort Dodge, Ia
8 hours ago · USGS 05480500 |
1,750 cfs | 4.82 ft | · | 51°F | 974 ft | Middle Des Moines |
|
West Nishnabotna River At Randolph, Ia
8 hours ago · USGS 06808500 |
1,740 cfs | 10.15 ft | 58°F | 52°F | 956 ft | West Nishnabotna |
|
Iowa River At Marshalltown, Ia
8 hours ago · USGS 05451500 |
1,730 cfs | 12.49 ft | · | 50°F | 853 ft | Middle Iowa |
|
Cedar River At Waverly, Ia
8 hours ago · USGS 05458300 |
1,620 cfs | 5.11 ft | 56°F | 49°F | 895 ft | Upper Cedar |
|
South Skunk River At Colfax, Ia
9 hours ago · USGS 05471050 |
1,590 cfs | 10.72 ft | · | 51°F | 793 ft | South Skunk |
|
Wapsipinicon River At Independence, Ia
8 hours ago · USGS 05421000 |
1,540 cfs | 6.20 ft | · | 47°F | 889 ft | Upper Wapsipinicon |
|
Shell Rock River At Shell Rock, Ia
9 hours ago · USGS 05462000 |
1,460 cfs | 8.76 ft | · | 49°F | 882 ft | Shell Rock |
|
Little Sioux River Near Turin, Ia
8 hours ago · USGS 06607500 |
1,210 cfs | 8.31 ft | · | 55°F | 1,029 ft | Little Sioux |
|
East Nishnabotna River At Red Oak, Ia
8 hours ago · USGS 06809500 |
1,150 cfs | 7.94 ft | · | 52°F | 1,013 ft | East Nishnabotna |
|
South Raccoon River At Redfield, Ia
9 hours ago · USGS 05484000 |
992 cfs | 4.12 ft | 32°F | 52°F | 917 ft | South Raccoon |
|
Turkey River Above French Hollow Cr At Elkader, Ia
9 hours ago · USGS 05412020 |
983 cfs | 6.56 ft | · | 47°F | 726 ft | Turkey |
|
West Fork Cedar River At Finchford, Ia
9 hours ago · USGS 05458900 |
914 cfs | 8.48 ft | · | 49°F | 859 ft | West Fork Cedar |
|
Cedar River At Charles City, Ia
8 hours ago · USGS 05457700 |
911 cfs | 3.38 ft | · | 47°F | 977 ft | Upper Cedar |
|
South Skunk River Below Squaw Creek Near Ames, Ia
8 hours ago · USGS 05471000 |
818 cfs | 12.79 ft | · | 50°F | 872 ft | South Skunk |
|
East Fork Des Moines River At Dakota City, Ia
8 hours ago · USGS 05479000 |
812 cfs | 9.46 ft | · | 50°F | 1,043 ft | East Fork Des Moines |
|
Big Sioux River At Akron, Ia
8 hours ago · USGS 06485500 |
787 cfs | 5.49 ft | · | 49°F | 1,151 ft | Lower Big Sioux |
|
Little Sioux River At Correctionville, Ia
8 hours ago · USGS 06606600 |
787 cfs | 5.73 ft | · | 51°F | 1,106 ft | Little Sioux |
|
North Skunk River Near Sigourney, Ia
8 hours ago · USGS 05472500 |
782 cfs | 7.18 ft | · | 48°F | 664 ft | North Skunk |
|
Upper Iowa River Near Dorchester, Ia
8 hours ago · USGS 05388250 |
705 cfs | 7.61 ft | · | 46°F | 668 ft | Upper Iowa |
|
Beaver Creek Near Grimes, Ia
8 hours ago · USGS 05481950 |
703 cfs | 6.05 ft | · | 55°F | 829 ft | Middle Des Moines |
|
Des Moines River At Humboldt, Ia
8 hours ago · USGS 05476750 |
674 cfs | 4.29 ft | · | 50°F | 1,066 ft | Upper Des Moines |
|
West Nishnabotna River At Hancock, Ia
8 hours ago · USGS 06807410 |
652 cfs | 3.76 ft | · | 52°F | 1,089 ft | West Nishnabotna |
|
Black Hawk Creek At Hudson, Ia
9 hours ago · USGS 05463500 |
591 cfs | 8.50 ft | · | 50°F | 897 ft | Middle Cedar |
|
Beaver Creek At New Hartford, Ia
8 hours ago · USGS 05463000 |
574 cfs | 4.55 ft | · | 49°F | 890 ft | Middle Cedar |
|
Nodaway River At Clarinda, Ia
8 hours ago · USGS 06817000 |
571 cfs | 11.33 ft | · | 51°F | 966 ft | West Nodaway |
|
Turkey River Near Eldorado, Ia
8 hours ago · USGS 05411850 |
567 cfs | 6.21 ft | · | 47°F | 897 ft | Turkey |
|
Boone River Near Webster City, Ia
8 hours ago · USGS 05481000 |
544 cfs | 3.22 ft | 35°F | 50°F | 1,028 ft | Boone |
|
Volga River At Littleport, Ia
8 hours ago · USGS 05412400 |
540 cfs | 5.93 ft | · | 47°F | 694 ft | Turkey |
|
English River At Kalona, Ia
8 hours ago · USGS 05455500 |
512 cfs | 5.85 ft | · | 47°F | 655 ft | Lower Iowa |
|
Boyer River At Logan, Ia
8 hours ago · USGS 06609500 |
510 cfs | 4.64 ft | · | 55°F | 1,014 ft | Boyer |
|
Squaw Creek At Ames, Ia
8 hours ago · USGS 05470500 |
501 cfs | 2.80 ft | · | 50°F | 907 ft | South Skunk |
|
North Fork Maquoketa River Near Fulton, Ia
8 hours ago · USGS 05418400 |
495 cfs | 3.81 ft | 39°F | 45°F | 689 ft | Maquoketa |
|
Upper Iowa River At Decorah, Ia
9 hours ago · USGS 05387500 |
494 cfs | 2.22 ft | · | 47°F | 854 ft | Upper Iowa |
|
Rock River Near Rock Valley, Ia
8 hours ago · USGS 06483500 |
494 cfs | 5.18 ft | · | 49°F | 1,238 ft | Rock |
|
South Skunk River Near Ames, Ia
8 hours ago · USGS 05470000 |
465 cfs | 4.90 ft | · | 50°F | 928 ft | South Skunk |
|
Wolf Creek Near Dysart, Ia
8 hours ago · USGS 05464220 |
458 cfs | 3.72 ft | · | 48°F | 835 ft | Middle Cedar |
|
East Nishnabotna River Near Atlantic, Ia
8 hours ago · USGS 06809210 |
438 cfs | 4.07 ft | · | 50°F | 1,109 ft | East Nishnabotna |
|
Chariton River Near Moulton, Ia
8 hours ago · USGS 06904010 |
431 cfs | 21.15 ft | · | 50°F | 847 ft | Upper Chariton |
|
Maquoketa River At Manchester, Ia
8 hours ago · USGS 05416900 |
422 cfs | 5.27 ft | · | 47°F | 920 ft | Maquoketa |
|
Little Sioux River At Linn Grove, Ia
8 hours ago · USGS 06605850 |
406 cfs | 6.34 ft | · | 49°F | 1,249 ft | Little Sioux |
|
Middle Raccoon River At Panora, Ia
8 hours ago · USGS 05483600 |
404 cfs | 5.12 ft | 35°F | 54°F | 997 ft | South Raccoon |
|
Middle River Near Indianola, Ia
8 hours ago · USGS 05486490 |
400 cfs | 8.66 ft | · | 55°F | 794 ft | Lake Red Rock |
|
Chariton River Near Rathbun, Ia
8 hours ago · USGS 06903900 |
396 cfs | 4.33 ft | · | 50°F | 855 ft | Upper Chariton |
|
North Raccoon River Near Sac City, Ia
8 hours ago · USGS 05482300 |
393 cfs | 8.45 ft | 75°F | 51°F | 1,179 ft | North Raccoon |
|
Indian Creek Near Mingo, Ia
8 hours ago · USGS 05471200 |
392 cfs | 5.10 ft | · | 51°F | 827 ft | South Skunk |
|
Middle Raccoon River Near Bayard, Ia
8 hours ago · USGS 05483450 |
385 cfs | 11.12 ft | · | 51°F | 1,054 ft | South Raccoon |
|
South Fork Iowa River Ne Of New Providence, Ia
9 hours ago · USGS 05451210 |
366 cfs | 4.59 ft | · | 50°F | 963 ft | Upper Iowa |
|
Upper Iowa River At Bluffton, Ia
9 hours ago · USGS 05387440 |
358 cfs | 3.77 ft | · | 47°F | 970 ft | Upper Iowa |
|
Wapsipinicon River Near Tripoli, Ia
8 hours ago · USGS 05420680 |
314 cfs | 8.88 ft | · | 49°F | 1,019 ft | Upper Wapsipinicon |
|
Winnebago River At Mason City, Ia
8 hours ago · USGS 05459500 |
311 cfs | 5.42 ft | · | 48°F | 1,101 ft | Winnebago |
|
North River Near Norwalk, Ia
8 hours ago · USGS 05486000 |
310 cfs | 8.15 ft | · | 55°F | 811 ft | Lake Red Rock |
|
Maple River At Mapleton, Ia
8 hours ago · USGS 06607200 |
280 cfs | 5.09 ft | · | 52°F | 1,114 ft | Maple |
|
Salt Creek Near Elberon, Ia
8 hours ago · USGS 05452000 |
273 cfs | 7.51 ft | · | 50°F | 802 ft | Middle Iowa |
|
Floyd River At James, Ia
8 hours ago · USGS 06600500 |
250 cfs | 8.64 ft | · | 53°F | 1,117 ft | Floyd |
|
Thompson River At Davis City, Ia
8 hours ago · USGS 06898000 |
236 cfs | 1.60 ft | · | 54°F | 910 ft | Thompson |
|
Little Cedar River Near Ionia, Ia
9 hours ago · USGS 05458000 |
212 cfs | 4.23 ft | · | 48°F | 1,000 ft | Upper Cedar |
|
Turkey River At Spillville, Ia
8 hours ago · USGS 05411600 |
210 cfs | 2.76 ft | · | 47°F | 1,067 ft | Turkey |
|
Big Bear Creek At Ladora, Ia
8 hours ago · USGS 05453000 |
186 cfs | 11.85 ft | · | 47°F | 771 ft | Middle Iowa |
|
Yellow River At Ion, Ia
9 hours ago · USGS 05389000 |
184 cfs | 6.14 ft | · | 47°F | 681 ft | Coon-Yellow |
|
Fourmile Creek At Des Moines, Ia
8 hours ago · USGS 05485640 |
168 cfs | 4.27 ft | · | 52°F | 813 ft | Lake Red Rock |
|
Old Mans Creek Near Iowa City, Ia
8 hours ago · USGS 05455100 |
155 cfs | 3.07 ft | 46°F | 47°F | 654 ft | Lower Iowa |
|
Monona-Harrison Ditch Near Turin, Ia
8 hours ago · USGS 06602400 |
149 cfs | 4.78 ft | · | 55°F | 1,021 ft | Monona-Harrison Ditch |
|
Soldier River At Pisgah, Ia
8 hours ago · USGS 06608500 |
136 cfs | 3.09 ft | · | 55°F | 1,047 ft | Blackbird-Soldier |
|
Ocheyedan River Near Spencer, Ia
8 hours ago · USGS 06605000 |
134 cfs | 2.77 ft | · | 48°F | 1,317 ft | Little Sioux |
|
Timber Creek Near Marshalltown, Ia
8 hours ago · USGS 05451700 |
123 cfs | 3.57 ft | · | 50°F | 862 ft | Middle Iowa |
|
Cedar Creek Near Oakland Mills, Ia
8 hours ago · USGS 05473400 |
118 cfs | 3.88 ft | · | 47°F | 590 ft | Skunk |
|
Iowa River Near Rowan, Ia
8 hours ago · USGS 05449500 |
113 cfs | 4.15 ft | · | 50°F | 1,187 ft | Upper Iowa |
|
South River Near Ackworth, Ia
8 hours ago · USGS 05487470 |
96 cfs | 5.47 ft | · | 55°F | 805 ft | Lake Red Rock |
|
Walnut Creek At Des Moines, Ia
9 hours ago · USGS 05484800 |
93 cfs | 3.88 ft | · | 55°F | 808 ft | North Raccoon |
|
Fourmile Creek Near Ankeny, Ia
8 hours ago · USGS 05485605 |
90 cfs | 2.56 ft | · | 52°F | 911 ft | Lake Red Rock |
|
Clear Creek Near Coralville, Ia
8 hours ago · USGS 05454300 |
90 cfs | 1.61 ft | · | 47°F | 660 ft | Lower Iowa |
|
Rock River Below Tom Creek At Rock Rapids, Ia
8 hours ago · USGS 06483290 |
83 cfs | 7.17 ft | · | 47°F | 1,316 ft | Rock |
|
Cedar Creek Near Bussey, Ia
8 hours ago · USGS 05489000 |
72 cfs | 5.09 ft | · | 54°F | 696 ft | Lower Des Moines |
|
Richland Creek Near Haven, Ia
8 hours ago · USGS 05451900 |
71 cfs | 11.41 ft | · | 50°F | 817 ft | Middle Iowa |
|
Clear Creek Near Oxford, Ia
9 hours ago · USGS 05454220 |
71 cfs | 2.65 ft | · | 47°F | 722 ft | Lower Iowa |
|
Floyd River At Alton, Ia
8 hours ago · USGS 06600100 |
68 cfs | 5.81 ft | · | 50°F | 1,289 ft | Floyd |
|
White Breast Creek Near Dallas, Ia
8 hours ago · USGS 05487980 |
52 cfs | 6.42 ft | · | 52°F | 773 ft | Lake Red Rock |
|
Walnut Creek Near Hartwick, Ia
8 hours ago · USGS 05452200 |
51 cfs | 1.99 ft | · | 50°F | 806 ft | Middle Iowa |
|
Rapid Creek Near Iowa City, Ia
8 hours ago · USGS 05454000 |
35 cfs | 4.18 ft | · | 47°F | 688 ft | Lower Iowa |
|
Big Creek Near Mt. Pleasant, Ia
9 hours ago · USGS 05473450 |
25 cfs | 3.70 ft | · | 47°F | 672 ft | Skunk |
|
Bloody Run Creek Near Marquette, Ia
8 hours ago · USGS 05389400 |
23 cfs | 4.11 ft | · | 47°F | 634 ft | Coon-Yellow |
|
English Creek Near Knoxville, Ia
8 hours ago · USGS 05488200 |
23 cfs | 8.56 ft | · | 52°F | 749 ft | Lower Des Moines |
|
East Fork 102 River At Bedford, Ia
8 hours ago · USGS 06819185 |
14 cfs | 10.91 ft | · | 52°F | 1,084 ft | One Hundred And Two |
|
South Fork Chariton River Near Promise City, Ia
8 hours ago · USGS 06903700 |
12 cfs | 3.15 ft | · | 51°F | 922 ft | Upper Chariton |
|
Chariton River Near Chariton, Ia
8 hours ago · USGS 06903400 |
9 cfs | 4.48 ft | · | 51°F | 968 ft | Upper Chariton |
About Iowa streamflow
What are river levels like in Iowa right now?
As of October 22, 2026, Iowa rivers are running at 361% of normal across 116 USGS streamgauges, and the Mississippi River At Clinton is reporting the highest discharge at 34,800 cfs. The full sortable gauge table is below.
Which Iowa river is running highest right now?
As of October 22, 2026, the highest discharge in Iowa is 34,800 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.