Flood Alert Issued for Lower River Colne and Frays River Affecting Multiple Counties

Alert Details

The Environment Agency has issued a Flood Alert (Severity Level 3) for the Lower River Colne and Frays River. The alert was officially raised on the morning of February 16, 2026, in response to high river levels that may lead to flooding.

Affected Areas

The alert encompasses the Lower River Colne and Frays River within the Hertfordshire and North London area. The geographic scope includes parts of the following counties and regions:

• Buckinghamshire
• Greater London
• Hertfordshire
• Hillingdon
• Slough
• Surrey
• Windsor and Maidenhead

Specific locations most likely to be affected include low-lying land and roads near rivers around Denham Colne, Willow Bank, Fountains Mill, Clisbys Bridge, West Drayton, Yiewsley, Poyle Trading Estate, Stanwell Mill, Staines Moor, and Pound Mill (Wraysbury).

What You Should Do

Residents in the warning area are advised to take care and avoid walking, cycling, or driving through flood water. The Environment Agency is closely monitoring the situation. It is recommended that those in affected areas stay informed and prepare for potential flooding of roads and low-lying land.

Expected Conditions

River levels remain high along the River Colne. Flooding is considered possible throughout the day on February 16, 2026. The primary hazard identified is the inundation of land and transport routes in close proximity to the riverbanks.

Timeline

The alert was issued at 8:44 AM on February 16, 2026. Environment Agency officials expect to provide an update on the situation by 5:00 PM on February 16, 2026, or sooner if conditions change significantly.