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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 00:05:05 UTC · Official GOV.UK warnings · Flood preparation & help guide
Denham is a village and civil parish in the unitary authority of Buckinghamshire, England, approximately 17 mi from central London, 2 mi northwest of Uxbridge and just north of junction 1 of the M40 motorway. The name is derived from the Old English for "homestead in a valley". It was listed in the Domesday Book of 1086 as Deneham. Denham contains the Buckinghamshire Golf Club.
Towns and villages near Denham with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
New Denham · Chalfont St Peter · Hayes · Harrow · Colnbrook · 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 Misbourne, about 100 m from the middle of Denham's gauges. It flows into the River Colne about 340 m 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 Misbourne nearest the middle of Denham'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.
Denham is monitored by 3 Environment Agency river level stations on the River Colne, the River Misbourne, in Buckinghamshire. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Colne is monitored by 2 stations (Denham Colne, Willowbank). The River Misbourne is monitored by 1 station (Denham Lodge). 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 Denham. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The River Colne at Willowbank including Uxbridge Moor; The River Pinn at Ickenham; The River Pinn at Uxbridge including Hillingdon; The Lower River Colne and Frays River at Uxbridge, West Drayton, Poyle and Stanwell Moor.
There are 2 storm overflows within 5km of Denham. None of the 2 with a reporting monitor are currently discharging. Enable "Sewage" on the map above to see their locations.
Each has its own page of live status and past discharges:
If flooding is forecast in Denham, 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.
Denham gets about 676 mm of rain a year on average (wettest month November, 76 mm; driest March, 42 mm). That is 42% 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: 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.
Denham has river level monitoring on River Colne, River Misbourne — 3 monitoring stations 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 25 recorded flood extents around the town centre since 1703, most recently in 2023. 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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