Illinois River At Henry, Il Realtime Data
ILLINOIS RIVER AT HENRY, IL
Realtime Data • Report • Conditions
17,600
Discharge (cfs)
20.0
Gauge Height (ft)
Streamflow discharge was last observed at 17,600 cfs, and a gauge height of 20.01 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 32,810 .
Weather today, Tomorrow,
The river is fed by various tributaries and has several dams along its course. The flow of the river varies depending on the season, with higher flows in the spring due to snowmelt and rainfall. Interesting facts about the hydrology of the Illinois River include the presence of invasive Asian carp, which have caused problems for the ecosystem, and the potential impact of climate change on the river's flow. Understanding flow patterns and water quality in the Illinois River is important for maintaining the health of the ecosystem and the communities that rely on it.
July 13, 2026
| Elevation | 440.0 ft |
| Last Updated | |
| Water velocity reading from field sensor, feet per second | 1.64 ft/sec |
| Gage height, ft | 20.01 ft |
| Chlorophyll a, estimated, water, in-situ, in-vivo fluorescence (IVF), concentration estimated from reference material, micrograms per liter | 25.01 ug/l |
| Streamflow, ft³/s | 17600.0 ft3/s |
| Phycocyanins (cyanobacteria), water, in situ, fluorometric method, excitation at 590 ±15 nm, emission at 685 ±20 nm, micrograms per liter | 2.22 ug/l |
| Specific conductance, water, unfiltered, microsiemens per centimeter at 25°C | 553.0 uS/cm @25C |
| Dissolved oxygen, water, unfiltered, mg/L | 9.6 mg/l |
| Dissolved oxygen, water, unfiltered, % saturation | 1310.0 % saturatn |
| Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 ±2.5°, formazin nephelometric units (FNU) | 38.4 FNU |
| pH, water, unfiltered, field, standard units | 8.2 std units |
| Temperature, water, °C | 27.3 deg C |
| Carbon dioxide, water, dissolved, in situ, parts per million by volume of dissolved gases | 1193.0 ppmv |
| Percent of Normal | 155% |
| Year Over Year Average | 11,300 cfs |
| 24hr Flow Prediction | cfs |
| Maximum Recorded | 153,000 cfs |
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