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No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-09 13:00:04 UTC · Official GOV.UK warnings · Flood preparation & help guide
Idless is a hamlet north of Truro in Cornwall, England. The River Allen rises north of St Allen and flows southwards through the Idless Valley into Truro. It is in the civil parish of Kenwyn.
The nearest watercourse on the river map is the River Allen, about 10 m from the middle of Idless's gauges. It flows into Truro River about 3.0 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 Allen nearest the middle of Idless'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.
Idless is monitored by 1 Environment Agency river level station on the River Allen, in Cornwall. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Allen is monitored by 1 station (Idless Dam). 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 Idless. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: River Allen (Kenwyn) from Idless Dam to Truro including Scawswater Mill, Copes Gardens, St Clements Street, Union Place, Wilkes Walk and the Shoppers Car Park; River Kenwyn from New Mill Dam to Truro including Coosebean Mill, St Georges Villas and St Georges Road; River Kenwyn at Truro including River Street, Victoria Square and Boscawen Street; Tidal Fal Estuary at Truro including Wharf side locations, River Walk, Newham Road, Lemon Quay, Malpas Road and other low lying locations including Boscawen Park.
There are 24 storm overflows within 5km of Idless. None of the 24 with a reporting monitor are currently discharging. 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 Idless, 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.
Idless gets about 1,139 mm of rain a year on average (wettest month December, 141 mm; driest June, 63 mm). That is close to 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), 0.3 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.
Idless has river level monitoring on River Allen — 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 1 recorded flood extent around the town centre since 1703, most recently in 1993. 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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