Environment Agency062WAF46MidLeeHerts and North London

River Lee at Hertford: flood history since 2009

The Environment Agency has issued 34 flood alerts for River Lee at Hertford since 25 Jan 2009, most often in January; the busiest year was 2024 (11).

Flood alerts only

The flood area

Flood area: River Lee at Hertford
Code: 062WAF46MidLee
Environment Agency area: Herts and North London
County: Essex, Hertfordshire
River or sea: River Lee
First in the history: 25 Jan 2009
Latest in the history file: 15 Feb 2026
Current status: check-for-flooding.service.gov.uk (the Environment Agency's live page)

Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.

2024 was the busiest year for River Lee at Hertford

Flood alerts, flood warnings and severe flood warnings (updates not counted), by year. 2026 runs to the end of June.

The numbers

Year	Alerts	Warnings	Severe
2026	4	0	0
2025	1	0	0
2024	11	0	0
2023	1	0	0
2021	2	0	0
2020	3	0	0
2017	1	0	0
2016	2	0	0
2015	1	0	0
2014	3	0	0
2013	2	0	0
2012	3	0	0

Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.

Most often in January

All alerts and warnings since 2009 by month.

Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.

Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.