Flood Alert Issued for River Thame and Chalgrove Brook Across Buckinghamshire, Hertfordshire, and Oxfordshire

Alert Details

A Flood Alert (Severity Level 3) has been issued by the Environment Agency for the Thames area. This alert indicates that high river levels may lead to flooding in the vicinity of the River Thame, Horsenden Stream, and Chalgrove Brook.

Affected Areas

The alert covers specific geographic regions within Buckinghamshire, Hertfordshire, and Oxfordshire. Flooding of low-lying land and roads is specifically expected to continue today between Stadhampton and Dorchester.

What You Should Do

Residents and travelers in the affected areas are advised to avoid using low-lying footpaths and roads near rivers, as these may be flooded. For the most current information, individuals should monitor river levels via the River Levels Online service.

Expected Conditions

River levels are currently high on parts of the River Thame. The forecast indicates rain overnight on February 26, 2026, with further precipitation expected tomorrow and into the weekend. Officials expect river levels to remain high and sensitive to additional rainfall over the coming days.

Timeline

The alert was officially raised at 10:59 AM on February 26, 2026. Flooding of low-lying areas is expected to continue through the day, with river levels remaining high through the weekend. The Environment Agency will provide an update by 12:00 PM on February 27, 2026, or sooner if the situation changes.