Get notified about St Johns Lock — tick as many as you like, they all share the notify settings below.
Alert me when (tick one or more)
Height for "Above a height"
Drag the line on the chart, or type a value:mASD
Quick pick:
You'll be notified when this gauge is rising more than 0.10 mASD/hr — a sign of rapidly increasing water levels.
Beta. You'll be notified when a flood wave detected at an upstream gauge is forecast to reach this station, with an estimated arrival time. Accuracy improves as we verify more waves.
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.
Notify by (tick one or more)
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On iPhone: tap Share → Add to Home Screen first, then open it from there and set the alert.
Each one is saved as its own alert — pause or remove them individually any time.
Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA data and are best-efforts. Terms
Current Level
0.124 mASD
▬ Steady
24h Max
0.124 mASD
24h Min
0.105 mASD
Typical Range
-0.01 - 0.25
mASD
Highest Recorded
0.95 mASD
EA official record
0.83 in our data (since Nov 2012)
Current level is 13% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
Flood predictions aren't generated for
lock / structure gauges —
their levels are driven by gate operation,
not by catchment rainfall, so the forecast models would have no skill here.
Downstream level
7 days
The level on the DOWNSTREAM side of this lock/weir structure — a separate EA
measure from the main (upstream) reading shown on the Current tab. Threshold bands
are computed from this gauge's own downstream history.
Long Term
🌍 floodradar.co.uk
—
Consecutive rainy days0 → 10+
Days Above Normal
This year vs 5-year monthly range
Recent Readings
Rising · +0.6 cm over 6h
23 Aug 23:15▬ steady0.124 mASD
23 Aug 23:00▲ +0.1 cm0.124 mASD
23 Aug 22:45▬ steady0.123 mASD
23 Aug 21:30▬ steady0.123 mASD
23 Aug 21:15▬ steady0.123 mASD
23 Aug 21:00▬ steady0.123 mASD
23 Aug 20:45▬ steady0.123 mASD
23 Aug 20:30▲ +0.1 cm0.123 mASD
23 Aug 20:15▬ steady0.122 mASD
23 Aug 20:00▬ steady0.122 mASD
23 Aug 19:45▲ +0.1 cm0.122 mASD
23 Aug 19:30▬ steady0.121 mASD
23 Aug 19:15▬ steady0.121 mASD
23 Aug 19:00▲ +0.1 cm0.121 mASD
23 Aug 18:45▬ steady0.120 mASD
23 Aug 18:30▲ +0.1 cm0.120 mASD
23 Aug 18:15▲ +0.1 cm0.119 mASD
23 Aug 18:00▬ steady0.118 mASD
23 Aug 17:45▬ steady0.118 mASD
23 Aug 17:300.118 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2008 for the 12 flood
areas linked to this gauge (nearest 1.1 km away).
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 Lechlade On Thames flood history.
Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.
Nearby Groundwater
Soil Moisture
🚽 Storm overflows on this river
Frequently asked questions
Is the River Thames at St Johns Lock flooding today?
The current level is 0.12m, which is within the typical range of -0.01 to 0.25m. Flooding is unlikely at this level.
Is the river level rising or falling at St Johns Lock?
Based on the most recent readings, the level is currently steady. The chart above shows the last 7 days of measurements, updated roughly every 15 minutes.
What is a normal level for the River Thames at St Johns Lock?
The typical range at this station is -0.01m to 0.25m, based on Environment Agency historical data. Levels above 0.25m are higher than usually seen and may indicate a flood risk.
How often is this river level data updated?
Readings are taken by the Environment Agency gauge roughly every 15 minutes and FloodRadar refreshes its data continuously, so the level shown is normally less than an hour old.
Embed this gauge on your website
Free live river-level widget — ideal for parish councils, angling clubs and local sites. Updates automatically.
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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:
