Flood Warning Issued for Iroquois County, IL

Source: NOAA · Iroquois County, IL

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NWS Chicago has issued a Flood Warning for Sugar Creek affecting Iroquois County with minor flooding forecast from late tonight through Sunday morning.

What this NWS weather alert tells you, and what most readers miss

This notice was issued by NOAA on July 7, 2026 and geographically references Iroquois County, IL. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Weather Alerts - determines the regulatory framework behind it, which shapes what remedies (refunds, replacements, recalls, evacuations) are available to affected individuals and who holds statutory responsibility for enforcement.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NOAA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action, a single localized NWS weather alert is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (weather, alert, Flood Warning, Illinois) map to related alerts in the same area of risk - browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.

Alert Details

Flood Warning issued by NWS Chicago IL. Effective from June 11 at 4:37PM CDT. Onset June 12 at 4:20AM CDT. Expires June 12 at 10:45AM CDT. Ends June 14 at 7:00AM CDT.

Affected Areas

Sugar Creek from near Milford downstream to confluence with Iroquois River at Watseka, including the Milford gauge in Iroquois County, IL. Additional rivers mentioned include Vermilion River near Leonore (La Salle County) and Illinois River at La Salle (Putnam, Bureau and La Salle Counties).

What You Should Do

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property.

Expected Conditions

Minor flooding is forecast. At 4:00 PM CDT Thursday the stage was 14.1 feet. The river is expected to rise above flood stage late tonight and continue rising to a crest of 19.6 feet early Saturday morning. Flood stage is 18.0 feet. At 19.0 feet, structures threatened in southwest Milford.

Timeline

From late tonight (June 12 at 4:20AM CDT) to Sunday morning (June 14 at 7:00AM CDT).

Original source: NOAA Official Notice ↗

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Frequently Asked Questions

Common questions about this NWS weather alert.

What is this NWS weather alert about?
NWS Chicago has issued a Flood Warning for Sugar Creek affecting Iroquois County with minor flooding forecast from late tonight through Sunday morning.
Which agency issued this alert?
This alert was issued by NOAA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects Iroquois County, IL. Check with NOAA for the most current geographic scope.
Where can I find more Weather Alerts updates?
Browse the full Weather Alerts feed on Areazine at areazine.com/weather/ for the latest updates from NOAA and other agencies.