Don and Rother catchment
• Dearne Washlands • South Yorkshire • ID: L0800 • Level
(26m ago) • 3 readings/hr • 43 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.
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 storm overflow starts discharging, from the water companies' near-real-time feeds. Which overflows:
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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
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. Its typical range is
worked out from this side's own history (the middle 90% of its readings), and the red
line is set 30% of that range above its typical high. This side has no learnt lines yet
(the main reading's "high for this river" and "very high" levels), so its colours can
differ from the main reading's.
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.
70 storm overflows are traced upstream of this gauge. 0 report discharging now, 66 report not discharging, and for 4 the monitor is offline or has not reported, so their status is not known.
Yorkshire Water · into Not Matched In Ea Consents Database · 1.4 km away in a straight line · several watercourses close by, nothing to choose between them
Yorkshire Water · into Clvrt Trib Of Kilnhurst Cut · 4.2 km away in a straight line · discharges into a canal
35 spills · 111 hours in 2025
Not discharging now · last
7 more within 6 km whose connection is not known.
15 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 →
In a typical year this gauge reaches its typical high of 10.50 m
on about 57 days.
This year so far: 6 days.
20266 days, 1 of them high · 1 highso far
202555 days, 4 of them high · 4 highpatchy data
2024131 days, 11 of them high · 11 high
2023103 days, 20 of them high · 20 high
202244 days
202126 days
20200 days patchy data
201959 days, 14 of them high · 14 highpatchy data
201833 days
20176 days
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 11.20 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2019 for the 6 flood
areas linked to this gauge (nearest 2.3 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 Dearne Washlands flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 6 areas linked to this gauge, nearest first.
Is the Dearne Washlands at Mexborough Dearne Mouth flooding today?
The current level is 10.01mAOD, which is within the typical range of 9.81 to 10.50mAOD. Flooding is unlikely at this level.
Is the river level rising or falling at Mexborough Dearne Mouth?
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 Dearne Washlands at Mexborough Dearne Mouth?
The typical range at this station is 9.81mAOD to 10.50mAOD, based on Environment Agency historical data. Levels above 10.50mAOD 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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