A Flood Alert was issued for Tidal River Avon at Bristol, Pill and Shirehampton in City of Bristol, North Somerset, South Gloucestershire on 11th September 2026. Affected watercourses included the River Avon.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Avon at Netham Weir rose 1.40m, peaking at 1.46m, while the River Avon at Bristol Netham Lock climbed 0.29m.
Environment Agency advice issued
High tides over the next two days may lead to flooding. Flooding is possible from 7:30PM to 9:30PM on 11/09, from 08:00am to 10:00am and from 08:00PM to 10:00PM on 12/09. Areas most at risk include the tidal River Avon from Sea Mills to Conham in Bristol and between the Avonmouth Bridge and Shirehampton Park including Pill and Shirehampton. The detailed tidal forecast for those who use it is for a peak level at Avonmouth Portbury. The first forecast high water of 7.42 mAODN is at 8:30PM 11/09, which is 0.14 m above tide tables, with Westerly force 4 winds. The second forecast high water is a
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Netham Weir | River Avon | +1.40m | 1.46m |
| Bristol Netham Lock | River Avon | +0.29m | 6.19m |
| Ashton Vale | River Avon | +0.08m | 1.01m |