Illinois River at Henry, IL
Marshall County, Illinois · USGS 05558300
Updated Sep 24, 9:45 AM CDT
How to read these numbers
How much water moves past the gauge each second. Higher numbers mean more water is moving downstream.
The water-surface height at this gauge. It is useful for tracking rises, falls and flood thresholds, but it is not the river's total depth.
How much the latest reading has risen or fallen compared with roughly 24 hours earlier.
The typical streamflow for this date based on USGS historical statistics. A multiple such as 3× means current flow is about three times the historical median.
Get Water Data's plain-language summary of current flow, historical context and recent direction.
Official action and flood thresholds where available. These levels are specific to each gauge location.
Gauge height and flood stage are station-specific. A 12-foot reading at one gauge should not be directly compared with 12 feet at another.
Read the full beginner guide →Above historical median · Falling
Streamflow is currently 21,600 ft³/s, 3.3× the historical median for this date. Flow has fallen 5,100 CFS over the past 24 hours.
Historical median for this date: 6,620 ft³/s · Based on USGS day-of-year statistics
Streamflow trend
About this gauge
Official USGS station
Get Water Data organizes provisional public monitoring data from the U.S. Geological Survey.
View USGS station →Latest available readings
Latest USGS river camera
Recent imagery from the U.S. Geological Survey.
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Compact live badge
A lightweight image that links back to this gauge page and stays updated with current USGS data.