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

Alert Details

The Environment Agency has issued a Flood Alert for the River Thame, Horsenden Stream, and Chalgrove Brook. The alert was officially raised at 10:37 AM on February 18, 2026, following reports of high river levels that may lead to flooding.

Affected Areas

The geographic scope of this alert includes regions within Buckinghamshire, Hertfordshire, and Oxfordshire. Specifically, flooding of low-lying land and roads is expected to continue today in the Thame, Stadhampton, and Dorchester areas. Officials also expect river levels in the Aylesbury area to rise in the coming 24 hours.

What You Should Do

Residents are advised to avoid using low-lying footpaths and roads near rivers, as these areas are susceptible to flooding. The Environment Agency recommends that individuals monitor the situation by checking the River Levels Online service for real-time updates on current conditions.

Expected Conditions

River levels are currently high on parts of the River Thame. While weather forecasts indicate predominantly light rain for the afternoon of February 18 and overnight, this precipitation may be heavy at times. Consequently, river levels along the rest of the river are expected to remain high over the next several days.

Timeline

The alert is effective as of February 18, 2026. Levels in the Aylesbury area are forecast to rise on February 19. The Environment Agency will provide an updated message by 12:00 PM on February 19, 2026, or sooner if the situation changes.