Flood Alert Issued for River Thame and Chalgrove Brook Across Buckinghamshire 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 10:09 AM on February 17, 2026, in response to high river levels that pose a risk of flooding to the surrounding environment.

Affected Areas

The geographic scope of this alert includes parts of Buckinghamshire, Hertfordshire, and Oxfordshire. Specifically, flooding of low-lying land and roads is expected to continue today in the following areas:

• Aylesbury
• Thame
• Stadhampton
• Dorchester

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 monitoring the situation via the River Levels Online service for the most current updates on local conditions.

Expected Conditions

High river levels are currently affecting portions of the River Thame. Although the forecast for the remainder of today and overnight is predominantly dry, additional rainfall is expected tomorrow. Consequently, river levels are anticipated to remain high over the next several days.

Timeline

The alert is effective as of February 17, 2026. Flooding of low-lying areas is expected to persist throughout the day. The Environment Agency plans to update this alert by 12:00 PM on February 18, 2026, or earlier if conditions change significantly.