A Flood Alert was issued for River Thames from Datchet to Shepperton Green in Slough, Surrey, Windsor and Maidenhead between 25th and 27th February 2026. Affected watercourses included the River Thames.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Thames at Romney Lock rose 3.96m, peaking at 4.12m, while the River Thames at Penton Hook climbed 3.86m.
Environment Agency advice issued
High river levels today may lead to flooding. Flooding is possible on 27 February 2026. River levels are high but slowly declining on the River Thames. Flooding of low lying land and roads is expected to continue today, 27 February 2026, especially in areas between Datchet and Shepperton Green. Light rainfall is forecast for today and tomorrow. We are monitoring rainfall and river levels. We are liaising with emergency services and local authorities. Avoid using low lying footpaths and any bridges near local watercourses. Go to River levels online for updates on current river levels. This mess
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Romney Lock | River Thames | +3.96m | 4.12m |
| Penton Hook | River Thames | +3.86m | 4.00m |
| Bell Weir | River Thames | +3.73m | 3.82m |
| Old Windsor Lock | River Thames | +3.65m | 3.89m |
| Shepperton Lock | River Thames | +3.64m | 3.76m |
| Chertsey Lock | River Thames | +3.26m | 3.63m |
| Windsor Park | River Thames | +0.57m | 4.23m |
| Staines | River Thames | +0.41m | 3.55m |
| Boveney Lock | River Thames | +0.09m | 0.17m |