Derwent catchment
• Thornton Lock Bielby Beck • East Riding of Yorkshire • ID: F2830 • Level
(32m ago) • 4 readings/hr • 119 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
0.110 m
▲ Rising slightly
24h Max
0.110 m
24h Min
0.078 m
Typical Range
0.09 - 0.45
m
Highest Recorded
1.19 m
EA official record
1.19 in our data (since Apr 1983)
Current level is 9% 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.
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
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.
6 storm overflows are traced upstream of this gauge, the nearest 7.4 km away along the river. 0 report discharging now, 6 report not discharging.
Yorkshire Water · into Unnamed Trib Of Derwent · 5.9 km away in a straight line · no mapped watercourse close enough to be sure
1 spill · 11 hours in 2025
Not discharging now · last
1 other overflow within 6 km is downstream of this gauge or on another branch of the river network, so it is 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. Explore the sewage map →
In a typical year this gauge reaches its typical high of 0.45 m
on about 52 days.
This year so far: 15 days.
202615 days so far
202546 days, 4 of them high · 4 high
202496 days, 17 of them high · 17 high
202397 days, 37 of them high · 37 high
202228 days, 4 of them high · 4 high
202162 days, 14 of them high · 14 high
202031 days, 4 of them high · 4 high
201920 days, 2 of them high · 2 high
201837 days, 6 of them high · 6 high
201724 days, 2 of them high · 2 highpatchy data
Counted from each day's highest reading. Days with missing or implausible readings are left out, so a year marked patchy may have run high more often than shown.
The darker part is days above 1.00 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2010 for the 3 flood
areas linked to this gauge (nearest 3.0 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 Thornton Lock Bielby Beck flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 3 areas linked to this gauge, nearest first.
🌊 Groundwater-fedSlow and steady — fed largely by groundwater, so levels change gradually, not in sudden spikes.
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
0.76
groundwater-fed — slow & steady
Avg Annual Rainfall
794 mm/yr
1991–2020 · +10% since 1941–70
Urban Extent
1.0%
largely rural
Highest Daily Mean Flow
12.19 m³/s
29 Oct 2023 · 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.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Flat-V weir
Operating since
1983
Station datum
6.2 mAOD
Flow record
1983–2024 · 41 yrs · 100% complete
Hydrometric area
27
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Frequently asked questions
Is the Bielby Beck at Thornton Lock flooding today?
The current level is 0.11m, which is within the typical range of 0.09 to 0.45m. Flooding is unlikely at this level.
Is the river level rising or falling at Thornton Lock?
Based on the most recent readings, the level is currently rising slightly. 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 Bielby Beck at Thornton Lock?
The typical range at this station is 0.09m to 0.45m, based on Environment Agency historical data. Levels above 0.45m 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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