River Mimram in Hertfordshire

Flooding is affecting low lying land, roads and gardens close to the River Mimram. The situation is improving but this alert remains in force due to rainfall over the winter period which resulted in high groundwater levels. We are monitoring the flooding that is currently affecting the Fulling Mill Lane, Singlers Marsh, and Codicote Road areas in Welwyn. Flooding to homes and businesses is unlikely at this time, but there may be a risk to very low-lying properties or those with basements. River levels in other areas remain below levels of concern. Avoid using low lying footpaths and any bridges near local watercourses and do not attempt to walk or drive through flood water. We are continuing to monitor the situation. This message will be updated by 5pm, Wednesday 21st May 2025, or as the situation changes.