Flash flooding forces 200+ evacuations at Amboy, Lee County IL on Sept 20

Flash flooding struck Lee County, Illinois on the evening of September 20, 2026, forcing the evacuation of more than 200 people from O’Connell’s RV Campground, located approximately four miles east-northeast of Amboy. The National Weather Service Chicago office (NWS LOT) confirmed the flash flood event and documented rapidly rising waters that surrounded structures at the campground and spread across roads throughout the surrounding area. What began as a severe weather threat escalated quickly into an active emergency, with local emergency management deploying drone assets to document the scope of flooding in real time.

Drone footage captured by emergency management showed numerous structures at and near O’Connell’s surrounded by floodwaters, with multiple vehicles at least partially submerged. As of 7:00 PM CDT on September 20, NWS Chicago reported that flooding remained ongoing — a sobering reminder of how fast conditions can deteriorate across the rural corridors connecting Amboy, Dixon, and the broader Lee County region. For property owners throughout the area, this event underscores the importance of knowing what to inspect once the water recedes and authorities confirm it is safe to return.

What the National Weather Service Confirmed

The NWS Chicago local storm report documented a flash flood event near 4 ENE Amboy in Lee County, Illinois on September 20, 2026. The following are the confirmed details from that report:

• Location: The flash flood was centered near a point approximately four miles east-northeast of Amboy, Lee County, Illinois.
• Evacuations: Approximately 200 people were evacuated from O’Connell’s RV Campground due to flooding.
• Structural flooding: Drone footage provided by emergency management confirmed numerous structures at and near the campground were surrounded by floodwaters.
• Vehicle submersion: Multiple vehicles were at least partially submerged in floodwaters at the scene.
• Road closures: Multiple roads in the area were flooded as a result of the event.
• Ongoing conditions: As of 7:00 PM CDT on September 20, 2026, flooding in the Lee County area remained ongoing per NWS Chicago.

For official NWS updates, watches, and warnings covering Lee County and the surrounding region, visit weather.gov. Residents are strongly encouraged to monitor NWS alerts and follow any evacuation orders or road closure advisories from local and county authorities until conditions are formally declared safe.

What Homeowners in Amboy and Dixon Should Check Now

Once the waters recede and officials have confirmed it is safe to return to your property, a thorough, methodical inspection is your most important first step. Flooding — even localized or short-duration flooding — can cause damage that is not immediately visible to the eye. Delay in identifying water intrusion, foundation issues, or structural compromise can significantly increase repair costs and create long-term problems such as mold growth and rot.

Here is what property owners in Amboy, Dixon, and the broader Lee County area should prioritize after this event:

Roof and Attic

• Access your attic and look for wet insulation, water staining on rafters or sheathing, or any standing water — these are indicators that water has breached the roof system.
• Inspect your roof from the ground, using binoculars if needed, for missing shingles, lifted flashing, or debris that may have impacted the surface during the storm.
• Check for any visible daylight from inside the attic space, which can signal gaps or openings created by storm conditions.

Siding and Exterior Walls

• Walk the full perimeter of your home and look for cracked, displaced, or buckled siding panels that could allow moisture to enter the wall assembly.
• Inspect the caulking and sealing around all windows and exterior doors for separation or deterioration.
• Note any soil erosion or washout along your foundation — grading that now directs water toward the structure will require correction before the next rain event.

Gutters and Downspouts

• Confirm that gutters are still properly fastened to the fascia board and have not been displaced by debris load or water volume during the flood event.
• Clear accumulated debris — mud, leaves, and sediment — that collected in gutters and at downspout openings.
• Verify that all downspouts are directing water away from the foundation, not pooling against it or discharging into saturated soil near the structure.

Trees and Landscaping

• Inspect trees near your home closely for root exposure, noticeable lean, or excessively soft and saturated soil at the base — saturated ground dramatically increases the risk of tree failure.
• Remove large debris that has washed against your foundation, fencing, detached garages, or outbuildings.
• Watch for signs of slope erosion, particularly on properties near drainage channels, low-lying fields, or any areas that experienced sheet-flow flooding.

Interior and Water Intrusion

• Check basements, crawl spaces, and lower levels for standing water, visible high-water marks, or the musty smell associated with early mold growth.
• Examine interior walls and flooring — especially near exterior walls, windows, and doors — for bubbling paint, warped materials, or discoloration.
• Do not use electrical outlets, switches, appliances, or HVAC equipment in any area that was exposed to floodwater until a licensed electrician has inspected and cleared those systems.

For general guidance on safely returning to your property after a flood event, the federal government’s preparedness resource at ready.gov offers practical steps for homeowners and renters.

If You Find Damage

Discovering water damage or structural issues in the aftermath of a flood can feel overwhelming. Taking a calm, documented, step-by-step approach in the first 24 to 72 hours is the single most important thing you can do to protect your property and support your insurance claim.

Document Everything Before You Clean Up

• Photograph and video every area of visible damage before any cleanup, drying, or repair work begins — this documentation is essential for your insurance carrier and any contractor assessments that follow.
• Use your phone’s timestamp feature and capture both wide-angle overviews and close-up detail shots for each affected area.
• Keep a written log of your inspection, noting dates, times, locations within the property, and what you observed.

Contact Your Insurance Company Promptly

• Report the damage to your insurer as soon as possible and ask specifically about your policy’s coverage for flood-related losses.
• Be aware that standard homeowner’s insurance policies typically do not cover flood damage — if you carry a separate flood insurance policy through the National Flood Insurance Program (NFIP), that coverage may be applicable.
• Ask your insurer when an adjuster will be assigned, and keep records of every communication — dates, names, and what was discussed.

Work With a Licensed Restoration Contractor

A licensed restoration contractor plays an important role in the recovery process. Allied Emergency Services can document damage thoroughly, prepare detailed repair estimates, and meet with your insurance adjuster on-site to walk through the scope of work item by item. We are an Illinois-licensed restoration contractor — we perform the covered repairs and provide the professional documentation your claim requires. Allied does not act as a public adjuster and does not negotiate, settle, or adjust insurance claims on your behalf; those functions are handled by your insurance company or any public adjuster you independently choose to hire.

Founded in 2015, Allied Emergency Services has spent more than a decade serving homeowners and commercial property owners across Illinois, Indiana, and Wisconsin following storm damage events. When flooding hits communities like Amboy and Dixon, our teams arrive with the licensing, certifications, and regional experience to assess damage accurately and complete repairs to code. Learn more about our storm damage restoration services and how we support property owners through the recovery process from first call to final repair.

This article is provided as general information only and does not constitute legal or insurance advice. For guidance specific to your policy, coverage, or legal situation, consult your insurance carrier, a licensed public adjuster, or a qualified attorney.

Contact Allied Emergency Services — Available 24/7

If your home or commercial property in Amboy, Dixon, or anywhere in Lee County was affected by the September 20 flash flooding, Allied Emergency Services is standing by around the clock. Early assessment protects your property, speeds up your claim, and helps prevent secondary damage like mold from taking hold while you wait.

• Call 24/7: (800) 792-0212
• Text for a free estimate: Text ESTIMATE to (844) 907-2546

Don’t wait for the damage to get worse. Our team is ready to respond.