Flood Alert Issued for River Thame, Horsenden Stream, and Chalgrove Brook in Three Counties

Alert Details

The Environment Agency has issued a flood alert for the River Thame, Horsenden Stream, and Chalgrove Brook. This alert indicates that high river levels may lead to flooding in the region. The alert was officially raised on February 28, 2026, at 10:29 AM.

Affected Areas

The alert covers geographic regions within Buckinghamshire, Hertfordshire, and Oxfordshire. Specifically, river levels are reported as high on parts of the River Thame in Dorchester. The warning encompasses the River Thame, Horsenden Stream, and Chalgrove Brook areas within the Thames agency district.

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 areas may be flooded. The Environment Agency recommends monitoring current conditions through the River Levels Online service for the latest updates.

Expected Conditions

Flooding of low-lying land and roads is expected to continue throughout Saturday, February 28, 2026. The current weather forecast predicts further light rain over the weekend. Officials expect river levels to remain high and sensitive to any additional rainfall over the coming days.

Timeline

The alert is currently in effect as of February 28, 2026. The Environment Agency is monitoring rainfall and river levels and expects the situation to persist through the weekend. A formal update to this message is scheduled to be provided by 12:00 PM on February 29, 2026, or sooner if the situation changes.