📢 Please take a minute to read this personal message from the creator of River Levels UK
This is an archived message. The status has changed more recently.
Flooding possible. Be prepared.
Flooding is affecting low lying land, roads and gardens close to the River Mimram. This is due to persistent rainfall in December and January which has led to high groundwater levels.
We are monitoring the flooding that is currently affecting the Fulling Mill Lane, Singlers Marsh, and Codicote Road areas in Welwyn.
There is an elevated risk of flooding caused by water emerging from a third party blocked culvert. 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 7th May 2025, or as the situation changes.
Information supplied by the Environment Agency
This information last updated 2:03pm, Wednesday 30th April 2025.
This page is a dedicated URL for a specific message issued at a particular time. You should not bookmark this page, as the current situation may have changed since this message was issued.
Warning no longer in force
Thu 29 May 2025, 10:59am
Flood alert
Wed 28 May 2025, 3:11pm
Flood alert
Wed 21 May 2025, 1:08pm
Flood alert
Wed 14 May 2025, 4:14pm
Flood alert
Wed 7 May 2025, 2:59pm
Flood alert
Wed 30 Apr 2025, 2:03pm
Flood alert
Wed 23 Apr 2025, 10:44am
Flood alert
Wed 16 Apr 2025, 2:58pm
Flood alert
Wed 9 Apr 2025, 1:28pm
Flood alert
Wed 2 Apr 2025, 2:22pm
The River Mimram at Whitwell, Welwyn, Tewin, Hertingfordbury and Hertford
Region: Herts and North London
Country: England
Counties covered: Hertfordshire
Watercourses covered: Mimram
The area bounded in blue on the map shows the area covered by flood alerts and warnings for River Mimram in Hertfordshire.
Note: the area shown on the map is the area covered by flood alerts and warnings. It is not a live map of current flooding. The area covered broadly equates to the area where the risk of flooding in any year is greater than 1% (the "hundred year" flood risk).
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.