FloodRadar
Log inCreate free account
FloodRadar
Log inCreate free account
No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-09 15:11:55 UTC · Official GOV.UK warnings · Flood preparation & help guide
Longford is monitored by 1 Environment Agency river level station on the River Colne, in Surrey. Water levels are updated every 15 minutes.
Towns and villages near Longford with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
Colnbrook · Wraysbury · Ashford · Ashford Common · Penton Hook · Charlton · Shepperton Green · Slough
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 Colne, about 10 m from the middle of Longford's gauges. It flows into the River Thames about 4.9 km downstream.
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 Colne nearest the middle of Longford'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.
Longford is monitored by 1 Environment Agency river level station on the River Colne, in Surrey. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Colne is monitored by 1 station (Stanwell Mill). 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 Longford. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The River Colne and Frays River at West Drayton and Stanwell Moor including Longford and Poyle; The Colne Brook at Iver and Colnbrook including Fulmer; River Thames at Horton including Horton Gardens and Kingsmead Quarry; The Colne Brook at Colnbrook including Horton and Wraysbury.
There is 1 storm overflow within 5km of Longford. None of the 1 with a reporting monitor is currently discharging. Enable "Sewage" on the map above to see their locations.
It has its own page of live status and past discharges:
If flooding is forecast in Longford, 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.
Longford gets about 628 mm of rain a year on average (wettest month November, 68 mm; driest March, 40 mm). That is 46% 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), 2.7 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: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Longford has river level monitoring on River Colne — 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 60 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.
FloodRadar helper · beta