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City of Ottawa IL
Tuesday March 10th, 2026 :: 08:11 p.m. CDT

Alert

Flash Flood Warning until 12:00AM Wednesday

FFWLOT The National Weather Service in Chicago has issued a

* Flash Flood Warning for... Northern La Salle County in north central Illinois...

* Until midnight CDT tonight.

* At 810 PM CDT, Doppler radar indicated multiple rounds of thunderstorms producing rainfall with rates up to 1-2 inches per hour across the warned area. Flash flooding is ongoing or expected to begin shortly, especially in urbanized areas and along the Illinois River Valley. HAZARD...Flash flooding. SOURCE...Radar. IMPACT...Rapid-onset flooding of creeks, streams, drainage ditches, streets, underpasses, low-lying areas, and other poor drainage areas.

* Some locations that will experience flash flooding include... Ottawa, Peru, La Salle, Marseilles, Sheridan, Lake Holiday, Oglesby, Seneca, North Utica, Serena, Naplate, Millington, Dayton, Troy Grove, Wedron, Harding, Prairie Center, Triumph and Norway.

* AFFECTED AREAS: LA SALLE, IL

Instructions:

A Flash Flood Warning means rapid-onset flooding is imminent or may already be occurring. Persons along creeks, drainage ditches, and other waterways should take immediate precautions to protect life and property.

Address/Location
City of Ottawa IL
301 W Lafayette St
Ottawa, IL 61350

Contact
Emergency: 9-1-1
Non-emergencies: 815-433-2131

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Alert Details

Severity:
Severe - Significant threat to life or property
Urgency:
Immediate - Responsive action SHOULD be taken immediately
Certainty:
Likely (p > ~50%)
Category:
Meteorological (inc. flood)
Event:
Flash Flood Warning

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