Environment Agency061WAF19ThameThames
River Thame, Horsenden Stream and Chalgrove Brook: flood history since 2008
The Environment Agency has issued 91 flood alerts for River Thame, Horsenden Stream and Chalgrove Brook since 13 Dec 2008, most often in January; the busiest year was 2012 (12).
Flood alerts only
The flood area
- Flood area
- River Thame, Horsenden Stream and Chalgrove Brook
- Code
- 061WAF19Thame
- Environment Agency area
- Thames
- County
- Buckinghamshire, Hertfordshire, Oxfordshire
- River or sea
- River Thame, Horsenden Stream, Chalgrove Brook
- First in the history
- 13 Dec 2008
- Latest in the history file
- 9 Jan 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 | 1 | 0 | 0 |
| 2025 | 6 | 0 | 0 |
| 2024 | 9 | 0 | 0 |
| 2023 | 10 | 0 | 0 |
| 2022 | 5 | 0 | 0 |
| 2021 | 5 | 0 | 0 |
| 2020 | 6 | 0 | 0 |
| 2019 | 5 | 0 | 0 |
| 2018 | 5 | 0 | 0 |
| 2017 | 5 | 0 | 0 |
| 2016 | 8 | 0 | 0 |
| 2015 | 5 | 0 | 0 |
| 2014 | 2 | 0 | 0 |
| 2013 | 4 | 0 | 0 |
| 2012 | 12 | 0 | 0 |
| 2011 | 2 | 0 | 0 |
| 2010 | 1 | 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 2008 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 |
|---|---|
| 9 Jan 2026 | Flood alert |
| 8 Dec 2025 | Flood alert |
| 14 Nov 2025 | Flood alert |
| 25 Feb 2025 | Flood alert |
| 10 Feb 2025 | Flood alert |
| 27 Jan 2025 | Flood alert |
| 5 Jan 2025 | Flood alert |
| 20 Dec 2024 | Flood alert |
| 24 Nov 2024 | Flood alert |
| 23 Sep 2024 | Flood alert |
| 7 Jul 2024 | Flood alert |
| 22 May 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.