Kishwaukee River at Marengo, IL

McHenry County, Illinois · USGS gauge 05438170 · NWS MRGI2 · Kishwaukee River flood status · Illinois river levels

Is Kishwaukee River at Marengo, IL flooding right now?

Kishwaukee River at Marengo, IL measured 7.53 ft on 2026-11-11 15:15:00 UTC. That observation was 4.5 ft below its 12 ft flood stage. This is the latest available reading, not a guarantee of current conditions.

Gauge height

7.53 ft

as of 50 min ago

Streamflow

77 cfs

data refreshed 4 min ago

Minor flooding here begins at 12 ft. The highest crest on record was 13.31 ft on Mon, Sep 18, 1972.

Streamflow outlook

NOAA National Water Model forecast, issued 10 hours ago. The NWM models discharge for every river reach in the country, including the many gauges the National Weather Service does not forecast individually. It is a model, not an official NWS river forecast, and it predicts flow rather than water level.

Flood stages at this gauge

Category	Stage	Current distance
Action	11.5 ft	4.0 ft below
Minor flood	12 ft	4.5 ft below

New to these numbers? What does flood stage mean? · How to read a river gauge · Why is the river rising?

Highest crests on record

Stage	Date
13.31 ft	1972-09-18
13.06 ft	2018-09-04
12.83 ft	1978-07-03
12.67 ft	2013-04-11
12.52 ft	2020-05-18

Last 7 days

Past 7 days · 7.53–8.02 ft

Nearby gauges

Gauge	Distance	County
Franklinville Creek at Franklinville, IL	5.1 mi	McHenry County
Unnamed Tr to Sb Kishwaukee C near Huntley, IL	10.7 mi	McHenry County
Kishwaukee River at Belvidere, IL	13.0 mi	Boone County
Nippersink Creek near Greenwood, IL	13.4 mi	McHenry County
Nippersink Creek above Wonder Lake, IL	14.7 mi	McHenry County

Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.

Sources: USGS monitoring location · NWS gauge & forecast