Environment Agency061WAF23RdngSonnThames
River Thames from Mapledurham to Sonning: flood history since 2009
The Environment Agency has issued 35 flood alerts for River Thames from Mapledurham to Sonning since 10 Feb 2009, most often in January; the busiest year was 2013 (5).
Flood alerts only
The flood area
- Flood area
- River Thames from Mapledurham to Sonning
- Code
- 061WAF23RdngSonn
- Environment Agency area
- Thames
- County
- Oxfordshire, Reading, West Berkshire, Wokingham
- River or sea
- River Thames
- First in the history
- 10 Feb 2009
- Latest in the history file
- 23 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 | 2 | 0 | 0 |
| 2024 | 5 | 0 | 0 |
| 2023 | 4 | 0 | 0 |
| 2021 | 2 | 0 | 0 |
| 2020 | 4 | 0 | 0 |
| 2019 | 2 | 0 | 0 |
| 2018 | 1 | 0 | 0 |
| 2016 | 3 | 0 | 0 |
| 2014 | 1 | 0 | 0 |
| 2013 | 5 | 0 | 0 |
| 2012 | 4 | 0 | 0 |
| 2011 | 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 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 |
|---|---|
| 23 Jan 2026 | Flood alert |
| 28 Jan 2025 | Flood alert |
| 6 Jan 2025 | Flood alert |
| 7 Dec 2024 | Flood alert |
| 25 Nov 2024 | Flood alert |
| 25 Sep 2024 | Flood alert |
| 29 Mar 2024 | Flood alert |
| 9 Feb 2024 | Flood alert |
| 31 Dec 2023 | Flood alert |
| 12 Dec 2023 | Flood alert |
| 1 Apr 2023 | Flood alert |
| 12 Jan 2023 | 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.