Flood Alert Issued for River Thame and Chalgrove Brook Across Three Counties

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 10:46 AM on March 5, 2026, due to high river levels that may lead to flooding in the region.

Affected Areas

The geographic scope of this alert includes parts of Buckinghamshire, Hertfordshire, and Oxfordshire. Specifically, flooding of low-lying land and roads is considered possible in the Chalgrove area. While the alert covers the River Thame and Horsenden Stream, officials note that levels along the River Thames currently remain below the flood risk threshold.

What You Should Do

Residents are advised to avoid using low-lying footpaths and roads near rivers, as these areas are most susceptible to flooding. The Environment Agency encourages the public to monitor current river levels via the River Levels Online service for real-time updates.

Expected Conditions

High river levels are currently being observed on the Chalgrove Brook through Chalgrove. The weather forecast for today, March 5, indicates a dry day; however, further rainfall is expected throughout much of tomorrow. Despite the predicted rain, agency officials expect river levels to begin decreasing over the coming days.

Timeline

The alert is effective immediately as of March 5, 2026. The Environment Agency will monitor rainfall and river levels continuously and expects to provide a formal update by 12:00 PM on March 6, 2026, or sooner if the situation changes.