A Flood Alert was issued for River Alt, Formby to Huyton in Knowsley, Lancashire, Liverpool, Sefton on 4th September 2026. Affected watercourses included the River Alt.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Douglas at Wanes Blades rose 1.65m, peaking at 1.94m, while the River Yarrow at Castle Bridge Croston climbed 1.61m.
Environment Agency advice issued
There is no longer a threat of flooding, though standing water and debris may still remain. Weather conditions are expected to improve and no further flooding is expected. We will continue to monitor the situation and will issue further alerts or warnings if necessary. If you have been evacuated only return to your property once the emergency services have advised that it is safe to do so. Never drive through flood water, just 30cm of fast flowing water is enough to move your car.
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Wanes Blades | River Douglas | +1.65m | 1.94m |
| Castle Bridge Croston | River Yarrow | +1.61m | 2.12m |
| Parbold | River Douglas | +1.15m | 1.20m |
| Davis Road | River Birket | +1.15m | 1.93m |
| Dovers Bridge | Dovers Brook | +1.02m | 1.84m |
| Kirkby | River Alt | +1.02m | 1.19m |
| Appley Bridge | River Douglas | +0.64m | 1.05m |
| Dyers lane | Sandy Brook | +0.23m | 0.26m |
| Crossens Pumping Station | The Sluice | +0.19m | 1.67m |