Flood alert for Upper River Colne and Radlett Brook
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Forecast rising river levels today may lead to flooding.
Flooding is possible on 18 February 2026 .
Locations most affected will be low lying land and roads near rivers in the Waterside, Lowbell Lane, London Colney and Warrengate Road areas.
We are monitoring rainfall and river levels .
Monitor local water levels and weather conditions and take care and avoid walking, cycling or driving through flood water.
This message will be updated by 9:00AM on 19 February 2026 or as the situation changes.
Flood alert area: The Upper River Colne and Radlett Brook at Colney Heath, London Colney, Borehamwood and Radlett.
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