NWS Flood Warning: Rock River minor-to-moderate flooding Mon–Thu, Rock Island/Henry/Whiteside IL

The National Weather Service office serving the Quad Cities issued a Flood Warning on September 20, 2026, for the Rock River at two gauge points in northwestern Illinois — near Joslin in Whiteside County and at Moline in Rock Island County — with flooding conditions expected to persist through September 24 and 25, 2026. The warning affects a wide stretch of the Rock River corridor, touching communities including Moline, Rock Island, East Moline, Joslin, Hampton, Big Island, Coal Valley, and Silvis — a broad swath of the Quad Cities metro and surrounding rural landscape.

NWS forecasters classify the Joslin reach of the Rock River as minor flooding and the Moline reach as moderate flooding, with both segments expected to crest by Tuesday. Property owners along the affected corridor should monitor official conditions at weather.gov and follow guidance from local emergency management. Allied Emergency Services is available 24/7 and is monitoring conditions throughout the region.

What the National Weather Service Confirmed

The following flood forecasts were issued by the NWS Quad Cities IA IL office for the Rock River. These are the confirmed figures as of the September 20, 2026, warning issuance.

Rock River near Joslin — Whiteside County

• Flood stage: 12.0 feet
• Expected rise above flood stage: Late Monday morning, September 21
• Forecast crest: 13.4 feet — Tuesday morning, September 22
• NWS flood classification: Minor
• Confirmed road impact: Barstow Road between the communities of Barstow and Osborn

Rock River at Moline — Rock Island County

• Expected rise above flood stage: Monday evening, September 21
• Forecast crest: 13.2 feet — Tuesday evening, September 22
• NWS flood classification: Moderate
• Confirmed area impacts: 60th Street south of John Deere Road; 56th Avenue from Green Valley Park to 48th Street; Canal Road in Big Island; and Smith’s Island

The warning period runs through September 24–25, 2026, meaning flood conditions are expected to remain elevated for several days after the crest passes. Receding water often leaves behind silt, debris, and trapped moisture — problems that may not be visible from a driveway inspection. Property owners should not assume the risk ends once river levels begin to fall.

For the latest official river stage readings and any updates to the warning, visit weather.gov.

What Homeowners in Moline, Rock Island, East Moline, and Nearby Communities Should Check Now

Even if your home sits above the direct flood zone, the sustained rainfall and saturated ground conditions that accompany a multi-day river flooding event can expose vulnerabilities across a property. Residents in East Moline, Rock Island, Coal Valley, Silvis, Hampton, Big Island, and surrounding areas should walk their property as soon as conditions are safe and inspect the following:

Roof and Attic

• Look for missing, lifted, or damaged shingles — extended wet weather accelerates wear on roof systems that were already showing their age
• Access the attic and check for daylight gaps, staining on rafters or sheathing, or any musty odor indicating moisture has found a path inside
• Pay close attention to roof penetrations — chimney flashing, pipe boots, vents, and skylights — where water commonly enters during prolonged rain events

Gutters and Downspouts

• Clear debris and confirm downspouts are directing water a minimum of four to six feet away from the foundation
• Look for sagging, separated, or pulled-away gutter sections — saturated debris adds significant weight that can pull fasteners loose over days of rain
• Check gutter seams and end caps for gaps; standing water in gutters can overflow and pool directly against the foundation

Siding and Exterior Walls

• Walk the full perimeter and inspect siding panels for cracks, warping, or gaps — even hairline openings allow moisture to migrate into wall cavities
• Inspect caulking around every window and door frame; failed seals are among the most common entry points for wind-driven rain
• On masonry or brick, look for white salt deposits (efflorescence) appearing on the surface — this indicates water is moving through the wall material

Foundation and Basement

• Check basement walls and the floor slab for new cracks, seepage staining, or any pooling — saturated soil places lateral pressure on foundation walls that can open existing hairline cracks
• Look for water staining at the base of interior walls, around window wells, and at the floor-wall joint
• If water has entered the basement, do not use electrical outlets or appliances in that area until a qualified electrician has inspected the system

Trees and Yard Drainage

• Inspect trees near the home for leaning, root heave, or hanging limbs — saturated soil reduces root stability dramatically, and trees that look fine today may be compromised
• Check for limbs that shifted toward the roofline during the storm
• Note any new erosion channels or low spots in the yard that are routing runoff toward the foundation rather than away from it

If You Find Damage

Finding storm or flood damage is stressful, but a methodical approach protects both your property and your ability to file an accurate insurance claim. Here is what to do:

1. Document before you touch anything. Photograph and video every affected area — roof, walls, ceilings, floors, and any personal property — before beginning temporary repairs. Capture wide shots for context and close-ups for detail. Date-stamping your images, either through your phone’s metadata or a written log, strengthens your claim file.
2. Make emergency temporary repairs only. If there is active water intrusion through a damaged roof section or broken window, protecting the structure from additional damage is both reasonable and expected by insurance carriers. Tarping a damaged section or boarding a window is appropriate. Retain all receipts for emergency materials.
3. Contact your insurance carrier promptly. Notify your insurer as soon as you discover damage. Ask what documentation they require, confirm your coverage details, and ask whether they will be sending their own adjuster to the property.
4. Get a written estimate from a licensed restoration contractor. A qualified contractor can assess the full scope of damage — including damage that is not immediately visible to the untrained eye — prepare a detailed written estimate, and meet with your insurance adjuster on-site to walk through the repair scope together. This is a standard part of the claims process and ensures the repair work is properly documented.
5. Verify contractor credentials. After flooding events, unlicensed contractors and out-of-state solicitors sometimes work affected neighborhoods. Illinois requires roofing contractors to hold a state license. Before signing any contract, ask for the license number and verify it with the Illinois Department of Financial and Professional Regulation.

Allied Emergency Services is an Illinois-licensed restoration contractor (IL Roofing License #104.019029) with more than a decade of experience in storm and flood damage restoration across the Greater Midwest. Our team can document property damage, prepare detailed repair estimates, and meet with your insurance adjuster on-site to walk through the scope of work — but we do not negotiate, settle, or adjust insurance claims on your behalf, as that function is reserved for licensed public adjusters. Our focus is making sure the physical repair is handled correctly, completely, and to code.

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

Contact Allied Emergency Services — Available 24/7

If you are in Moline, Rock Island, East Moline, or anywhere along the Rock River corridor and you have found storm or flood-related damage, do not wait. Moisture problems compound quickly — mold growth can begin within 24 to 48 hours of water intrusion, and delays in addressing water damage can significantly expand the scope and cost of repairs.

Allied Emergency Services has served the Quad Cities and Greater Midwest since 2015 and is standing by:

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

We serve Moline, Rock Island, East Moline, Joslin, Hampton, Big Island, Coal Valley, Silvis, and communities throughout the Quad Cities metro and across Illinois, Indiana, and Wisconsin. When the river rises and the damage shows up, Allied is ready to help you move forward.