Flood Alert Issued for River Thame and Chalgrove Brook in Oxfordshire and Surrounding Counties

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 9:03 AM on March 9, 2026, following reports of high river levels that may lead to flooding.

Affected Areas

The geographic scope of this alert includes parts of Buckinghamshire, Hertfordshire, and Oxfordshire. Specific concern is noted for the Chalgrove area, where flooding of low-lying land and roads remains possible. While the Chalgrove Brook is currently at high levels, the River Thame remains below the flood risk threshold at this time.

What You Should Do

Residents in the warning area are advised to avoid using low-lying footpaths and roads near rivers, as these areas may be flooded. Local residents should monitor current conditions by visiting River Levels Online for real-time updates.

Expected Conditions

High river levels are currently impacting the Chalgrove Brook through Chalgrove. The weather forecast for today and tomorrow indicates predominantly dry conditions with only light showers possible. Due to these conditions, the Environment Agency expects river levels to fall very slowly over the coming days.

Timeline

The alert was issued on the morning of March 9, 2026. Officials are monitoring rainfall and river levels closely and expect to provide an updated message by 12:00 PM on March 9, 2026, or sooner if the situation changes.