Thames from Hurley to Teddington catchment
• Trowlock Island • Greater London • ID: 3404TH • Level
(27m ago) • 4 readings/hr • 175 views
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You'll be notified when this gauge is rising more than 0.10 m/hr — a sign of rapidly increasing water levels.
You'll be notified when a new storm-overflow (sewage) discharge starts within ~3 km of this gauge, based on the water companies' near-real-time feeds.
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Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA/NRW data and are best-efforts. Terms
Experimental model fusing soil moisture, river flow, groundwater and catchment
character. The shaded band is its 10–90% range, widened so that about 80% of recent outcomes fall inside it.
Under evaluation — not yet promoted, so treat as a second opinion.
Storm overflows whose water reaches this gauge on the mapped river network, nearest first by distance along the river. The status is each water company's monitor: it says whether an overflow is discharging, not how much or what it contains.
159 storm overflows are traced upstream of this gauge, the nearest 1.3 km away along the river. 4 report discharging now, 144 report not discharging, and for 11 the monitor is offline or has not reported, so their status is not known.
Thames Water · into Old Pyl Ditch · 5.5 km away in a straight line · no mapped watercourse close enough to be sure
1 spill · 1 hours in 2025
Not discharging now · last
3 other overflows within 6 km are downstream of this gauge or on another branch of the river network, so they are not listed.
These are the water companies' monitor statuses; a spill does not by itself explain a change in the gauge level. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels. Sewage & storm overflows →
Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record.
See also the Trowlock Island flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 38 areas linked to this gauge, nearest first.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Thames at Trowlock Island flooding today?
The current level is 4.63m, which is within the typical range of 4.42 to 5.00m. Flooding is unlikely at this level.
Is the river level rising or falling at Trowlock Island?
Based on the most recent readings, the level is currently steady. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
What is a normal level for the River Thames at Trowlock Island?
The typical range at this station is 4.42m to 5.00m, based on Environment Agency historical data. Levels above 5.00m are higher than usually seen and may indicate a flood risk.
How often is this river level data updated?
Readings are supplied by the Environment Agency gauge. FloodRadar checks for updates roughly every 15 minutes; the timestamp above shows how recent the latest available reading is.
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📮 Flood risk by postcode near this gauge
Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:
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