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

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 9:24 AM on March 14, 2026, following reports of high river levels that may lead to flooding in the region.

Affected Areas

The alert covers geographic areas within Buckinghamshire, Hertfordshire, and Oxfordshire. Specific concern is noted for the Chalgrove Brook through Chalgrove. While the River Thame is currently below the flood risk threshold, flooding of low-lying land and roads in the Chalgrove area remains possible today.

What You Should Do

Residents and visitors in the affected regions are advised to take the following precautions:

• Avoid using low-lying footpaths and roads near rivers, as these areas may be submerged.
• Monitor local weather reports and river conditions.
• Visit River Levels Online for real-time updates on water levels in your specific area.

Expected Conditions

River levels are currently high on the Chalgrove Brook. Although the forecast for Saturday, March 14, is mostly dry with only a chance of showers, river levels are expected to remain high over the coming days. The Environment Agency notes that river levels remain highly sensitive to further rainfall.

Timeline

The alert is effective as of March 14, 2026. Further rain is forecast for Sunday, March 15, which may sustain or increase current river levels. This message is scheduled to be updated by 6:00 PM on March 14, 2026, or sooner if the situation changes.