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Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Updated 2026-10-10 00:05:24 UTC · Official GOV.UK warnings · Flood preparation & help guide
Trowlock Island is a residential island in the River Thames 450 metres (490 yd) upstream of Teddington Lock on the non-tidal Kingston reach less than 10 metres from the northern bank, in the London Borough of Richmond upon Thames, England.
Towns and villages near Trowlock Island with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
Surbiton · Thames Ditton · Isleworth · Weston Green · West Molesey · Hinchley Wood · Chiswick · Hersham
Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.
The nearest watercourse on the river map is the River Thames, about 70 m from the middle of Trowlock Island's gauges. It flows on to the sea.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on the River Thames nearest the middle of Trowlock Island's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Trowlock Island is monitored by 1 Environment Agency river level station on the River Thames, in Greater London. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Thames is monitored by 1 station (Trowlock Island). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 8 Environment Agency flood warning areas within 10km of Trowlock Island. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: River Thames at Trowlock Island including the Royal Canoe Club; River Thames at Trowlock Island including the Royal Canoe Club; River Thames at Teddington including Broom Road and Lower Teddington Road; River Thames at Kingston-upon-Thames town including, central Kingston, the area around Canbury Gardens and Albany Park Road.
There are 11 storm overflows within 5km of Trowlock Island. None of the 9 with a reporting monitor are currently discharging (2 have no live status right now). Enable "Sewage" on the map above to see their locations.
6 of them, nearest first, with their own page of live status and past discharges:
If flooding is forecast in Trowlock Island, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Trowlock Island gets about 635 mm of rain a year on average (wettest month October, 69 mm; driest March, 38 mm). That is 45% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.6 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Watch. Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Trowlock Island has river level monitoring on River Thames — 1 monitoring station in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 16 recorded flood extents around the town centre since 1703, most recently in 2002. That is a count of mapped extents, not of separate floods. Records, not floods: no outline on the record is not evidence a place has not flooded. See the flood history link below.
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