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This is an archived message. The status has changed more recently.
Flooding possible. Be prepared.
Rising river levels throughout the evening may lead to flooding.
Flooding is possible from overnight on 12 March 2026 to the following morning.
Locations most affected will be low lying land and roads near rivers.
We are closely monitoring the situation .
Take care and avoid walking, cycling or driving through flood water and consider activating any flood protection products you may have
This message will be updated by 10:00AM on 13 March 2026 or as the situation changes.
Information supplied by the Environment Agency
This information last updated 6:37pm, Thursday 12th March.
Flood alert
Wed 26 Aug 2026, 9:38pm
Warning no longer in force
Fri 13 Mar 2026, 9:47am
Flood alert
Thu 12 Mar 2026, 6:37pm
Warning no longer in force
Thu 19 Feb 2026, 9:07am
Flood alert
Wed 18 Feb 2026, 4:08pm
Warning no longer in force
Mon 16 Feb 2026, 9:17am
Flood alert
Sun 15 Feb 2026, 4:42pm
Flood alert
Sun 15 Feb 2026, 9:06am
Flood alert
Sat 14 Feb 2026, 5:04pm
Warning no longer in force
Sat 7 Feb 2026, 5:18pm
The Upper River Colne and Radlett Brook at Colney Heath, London Colney, Borehamwood and Radlett
Region: Herts and North London
Country: England
Counties covered: Hertfordshire
Watercourses covered: River Colne
The area bounded in blue on the map shows the area covered by flood alerts and warnings for Upper River Colne and Radlett Brook.
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.