* WHAT...Heat index values up to 103.
* WHERE...Portions of east central, south central and southeast
Wisconsin.
* WHEN...Until 8 PM CDT this evening.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses to occur.
Heat Advisory
Until 2026-07-15T13:15:00-05:00
•
National Weather Service
* WHAT...Heat index values up to 103.
* WHERE...Portions of east central, south central and southeast
Wisconsin.
* WHEN...Until 8 PM CDT this evening.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses to occur.
ROCK RIVER AT HORICON, WI
Realtime Data
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Report
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Conditions
152
Discharge (cfs)
6.7
Gauge Height (ft)
Streamflow discharge was last observed at 152 cfs, and a gauge height of 6.70 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 143 .
Weather today, Tomorrow,
The Rock River's constituents include agricultural drainage, wastewater effluent, and urban runoff. There are numerous dams on the Rock River, including the Horicon Dam, which can impact flow rates. Seasonal trends show that flow rates typically peak in the spring due to snow melt and precipitation, and then decrease in the summer and fall. An interesting fact about the Rock River is that it played a significant role in the transportation of goods during the 19th century, with steamboats traveling up and down the river.
July 15, 2026
Elevation
879.0 ft
Last Updated
Mean water velocity for discharge computation, feet per second
0.33 ft/sec
Gage height, ft
6.7 ft
Stream water level elevation above NAVD 1988, in ft