Flood Alert Issued for River Thame, Horsenden Stream, and Chalgrove Brook in Thames Region

Alert Details

The Environment Agency has issued a Flood Alert (Severity Level 3) for the River Thame, Horsenden Stream, and Chalgrove Brook. The alert was officially raised on March 2, 2026, at 8:23 AM following reports of high river levels in the Thames area.

Affected Areas

The geographic scope of this alert includes the River Thame, Horsenden Stream, and Chalgrove Brook. The affected regions span across Buckinghamshire, Hertfordshire, and Oxfordshire. Specifically, river levels are reported as high on parts of the River Thame in the Dorchester area.

What You Should Do

Residents and visitors in the warning area are advised to take the following precautions:

• Avoid using low-lying footpaths and roads near rivers, as these areas are prone to flooding.
• Monitor local conditions and stay informed on changing water levels.
• Visit the River Levels Online service for the most current updates on river conditions.

Expected Conditions

Flooding of low-lying land and roads is expected to continue throughout Monday, March 2, 2026. While river levels remain high, the current meteorological forecast indicates a dry day today followed by several days of dry weather. Consequently, the Environment Agency expects river levels to begin decreasing over the coming days.

Timeline

The alert is currently in effect as of March 2, 2026. Officials are monitoring rainfall and river levels continuously. This message is scheduled to be updated by 12:00 PM on March 3, 2026, or sooner if the situation changes significantly.