Lower Lee catchment
• Walthamstow • Greater London • ID: 5380TH • Level
(33m ago) • 4 readings/hr • 130 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
Current Level
0.025 mASD
▬ Steady
24h Max
0.027 mASD
24h Min
0.023 mASD
Typical Range
0.01 - 1.35
mASD
Highest Recorded
2.20 mASD
EA official record
2.19 in our data (since Oct 1981)
Current level is 1% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
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.
River Flow
90 days
Daily mean discharge (m³/s) with the daily min–max band, from the EA Hydrology API. Flow is the volume of water passing the gauge — often a more direct flood signal than level.
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.
Flow Data: Daily mean flow (m³/s) to 7 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
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 Walthamstow flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 10 areas linked to this gauge, nearest first.
🌊 Mixed responseA balance of quick runoff and slower groundwater baseflow.
Your catchment is all the land that drains rainfall into the river above this gauge. Its character — how
steep, wet, wooded, urban or chalky that land is — decides how fast rain here turns into a rising river. A steep, bare or clay
catchment is “flashy” (rises and falls quickly, floods easily); a flat, chalk or well-wooded one is
slow and steady. The tiles below put numbers to that; the flow-duration curve reads left-to-right
from the river’s typical high flows (Q5) down to its low flows (Q95) — a steep curve means a flashy river.
The physical character of the land that drains to this gauge, and how it shapes its flood response — from the National River Flow Archive (UKCEH).
Baseflow Index
0.53
mixed response
Avg Annual Rainfall
653 mm/yr
1991–2020 · +3% since 1941–70
Urban Extent
9.2%
partly urbanised
Highest Daily Mean Flow
112 m³/s
30 Oct 2000 · daily mean, not the instantaneous peak
Flow-Duration Curve
Daily flow (m³/s) exceeded each % of the time — a steep curve is flashy, a flat one is steady. Q5 high · Q50 median · Q95 low.
Gauging station located in a flood relief channel in the lower Lee Valley.
More detail
The catchment
A mainly pervious (Chalk) catchment with extensive Drift cover. Predominantly rural headwaters; significant urban growth in lower valley.
The station
Crump weir 17.1m broad (insensitive) located within a concrete flood relief channel.
Flow regime
The distribution of flows in the R. Lee and the flood channel is controlled by sluices at Chalk Bridge. Discharge is a factor in the operational control of the tidal barrier at Bow Creek. As Low Hall is a managed channel with main purpose to convey flood flows, there are periods when the water level drops below the level of the weir crest and the gauging station records zero flow.
The flow record
Combination of flows with the Lee at Lea Bridge (38032) provides total outflow of the Lee into the tidal Thames.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1974
Station datum
4.7 mAOD
Flow record
1980–2024 · 44 yrs · 98% complete
Hydrometric area
38
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Frequently asked questions
Is the River Lee at Walthamstow, Low Hall flooding today?
The current level is 0.03m, which is within the typical range of 0.01 to 1.35m. Flooding is unlikely at this level.
Is the river level rising or falling at Walthamstow, Low Hall?
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 Lee at Walthamstow, Low Hall?
The typical range at this station is 0.01m to 1.35m, based on Environment Agency historical data. Levels above 1.35m 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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