A Flood Alert was issued for River Thames from Mapledurham to Sonning in Oxfordshire, Reading, West Berkshire, Wokingham between 25th and 28th February 2026. Affected watercourses included the River Thames.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Thames at Mapledurham Lock rose 3.63m, peaking at 3.72m, while the River Thames at Sonning Lock climbed 3.34m.
Environment Agency advice issued
High river levels may lead to flooding. River levels remain high but are falling slowly on the River Thames from Mapledurham to Sonning. Flooding of low lying land and roads is expected to continue today 28 February 2026, especially in the Sonning area. The forecast is for some further light rain over the weekend. Levels are stabilising in the area but are expected to remain high and sensitive to further rainfall over the coming days. We are monitoring rainfall and river levels. Avoid low lying footpaths and roads near rivers, which may be flooded. Go to River Levels Online for updates on curr
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Mapledurham Lock | River Thames | +3.63m | 3.72m |
| Sonning Lock | River Thames | +3.34m | 3.50m |
| Marsh Lock | River Thames | +3.13m | 3.27m |
| Shiplake Lock | River Thames | +3.08m | 3.27m |
| Caversham Lock | River Thames | +2.92m | 3.08m |
| Whitchurch Lock | River Thames | +2.81m | 2.88m |
| Cleeve Lock | River Thames | +2.76m | 2.78m |
| Hurley Lock | River Thames | +2.16m | 2.23m |
| Hambleden Lock | River Thames | +0.60m | 0.70m |