Environment Agency062WAF28LowColneHerts and North London
Lower River Colne and Frays River: flood history since 2009
The Environment Agency has issued 36 flood alerts for Lower River Colne and Frays River since 10 Feb 2009, most often in January; the busiest year was 2024 (9).
Flood alerts only
The flood area
- Flood area
- Lower River Colne and Frays River
- Code
- 062WAF28LowColne
- Environment Agency area
- Herts and North London
- County
- Buckinghamshire, Greater London, Hertfordshire, Hillingdon, Slough, Surrey, Windsor and Maidenhead
- River or sea
- River Colne
- First in the history
- 10 Feb 2009
- Latest in the history file
- 4 Feb 2026
- Current status
- check-for-flooding.service.gov.uk (the Environment Agency's live page)
Flood alert, flood warning, severe flood warning: what each means
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
How many alerts and warnings a year?
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 | 6 | 0 | 0 |
| 2024 | 9 | 0 | 0 |
| 2023 | 5 | 0 | 0 |
| 2021 | 1 | 0 | 0 |
| 2020 | 3 | 0 | 0 |
| 2019 | 1 | 0 | 0 |
| 2014 | 4 | 0 | 0 |
| 2013 | 1 | 0 | 0 |
| 2012 | 2 | 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.
When in the year?
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.
Before July 2026: the latest in the history file
| Date | Level |
|---|---|
| 4 Feb 2026 | Flood alert |
| 28 Jan 2026 | Flood alert |
| 22 Jan 2026 | Flood alert |
| 16 Jan 2026 | Flood alert |
| 19 Dec 2025 | Flood alert |
| 24 Feb 2025 | Flood alert |
| 10 Feb 2025 | Flood alert |
| 27 Jan 2025 | Flood alert |
| 7 Jan 2025 | Flood alert |
| 5 Jan 2025 | Flood alert |
| 6 Dec 2024 | Flood alert |
| 24 Nov 2024 | Flood alert |
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.