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

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 at 10:16 AM on February 19, 2026, in response to rising river levels.

Affected Areas

The geographic scope of this alert includes regions within Buckinghamshire, Hertfordshire, and Oxfordshire. Specifically, flooding is expected to continue today in the Thame, Stadhampton, and Dorchester areas, impacting low-lying land and local roads.

What You Should Do

Residents in the affected areas are advised to avoid using low-lying footpaths and roads near rivers, as these may be submerged. The Environment Agency recommends checking “River Levels Online” for real-time updates on current conditions.

Expected Conditions

River levels are currently high on parts of the River Thame. While predominantly light rain is forecast over the next 48 hours, the Environment Agency notes that rainfall may be heavy at times. Consequently, river levels are expected to remain high and will be sensitive to any further precipitation over the coming days.

Timeline

The alert is effective as of February 19, 2026. Officials are monitoring rainfall and river levels continuously and expect to provide an updated message by 12:00 PM on February 20, 2026, or sooner if the situation changes.