Environment Agency061WAB23TrowlockThames
River Thames at Trowlock Island: flood history since 2013
The Environment Agency has issued 99 flood alerts for River Thames at Trowlock Island since 4 Nov 2013, most often in January; the busiest year was 2024 (18).
Flood alerts only
The flood area
- Flood area
- River Thames at Trowlock Island
- Code
- 061WAB23Trowlock
- Environment Agency area
- Thames
- County
- Greater London, Richmond upon Thames
- River or sea
- River Thames
- First in the history
- 4 Nov 2013
- Latest in the history file
- 30 Mar 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 | 6 | 0 | 0 |
| 2025 | 6 | 0 | 0 |
| 2024 | 18 | 0 | 0 |
| 2023 | 7 | 0 | 0 |
| 2022 | 10 | 0 | 0 |
| 2021 | 6 | 0 | 0 |
| 2020 | 12 | 0 | 0 |
| 2019 | 7 | 0 | 0 |
| 2018 | 5 | 0 | 0 |
| 2017 | 1 | 0 | 0 |
| 2016 | 8 | 0 | 0 |
| 2015 | 5 | 0 | 0 |
| 2014 | 5 | 0 | 0 |
| 2013 | 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.
When in the year?
All alerts and warnings since 2013 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 |
|---|---|
| 30 Mar 2026 | Flood alert |
| 2 Mar 2026 | Flood alert |
| 16 Feb 2026 | Flood alert |
| 12 Feb 2026 | Flood alert |
| 1 Feb 2026 | Flood alert |
| 22 Jan 2026 | Flood alert |
| 20 Dec 2025 | Flood alert |
| 7 Dec 2025 | Flood alert |
| 30 Mar 2025 | Flood alert |
| 27 Feb 2025 | Flood alert |
| 28 Jan 2025 | Flood alert |
| 6 Jan 2025 | 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.