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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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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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Current Level
0.674 m
▼ Easing
24h Max
0.720 m
24h Min
0.670 m
Typical Range
0.31 - 1.33
m
Highest Recorded
4.27 m
EA official record
4.27 in our data (since Jan 1976)
Current level is 16% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
Prediction V2
Prediction Eris
Nimbus beta
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. The nearest rain gauge has sent no readings in the last day, so Nimbus has no recent measured rain to work from 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 6 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.
7 storm overflows are traced upstream of this gauge, the nearest 1.3 km away along the river. 0 report discharging now, 7 report not discharging.
United Utilities · into Hallgarth Beck · 1.6 km away in a straight line · no mapped watercourse close enough to be sure
114 spills · 1,132 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. Explore the sewage map →
In a typical year this gauge reaches its typical high of 1.33 m
on about 31 days.
This year so far: 5 days.
20265 days so far
202537 days, 4 of them high · 4 high
202425 days, 3 of them high · 3 high
202344 days, 5 of them high · 5 high
202219 days
202129 days, 9 of them high · 9 high
202047 days, 8 of them high · 8 high
201917 days, 3 of them high · 3 high
20188 days, 1 of them high · 1 highpatchy data
20173 days patchy 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 2.05 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2008 for the 14 flood
areas linked to this gauge (nearest 0.7 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 Portinscale flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 14 areas linked to this gauge, nearest first.
🌊 Steep & flashySteep catchment sheds rain quickly — expect fast, sharp rises after heavy rain.
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
0.41
mixed response
Avg Annual Rainfall
2,534 mm/yr
1991–2020 · +7% since 1941–70
Urban Extent
0.3%
largely rural
Median Annual Flood
105 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
299 m³/s
5 Dec 2015 · 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.
Velocity area station located between Derwent and Bassenthwaite lakes.
More detail
The catchment
Geology mainly Borrowdale Volcanic series with Skiddaw Slates in the north and igneous intrusions east of Keswick (e.g. Castlehead Dolorite, St.John's and Threlkeld Microgranite). Boulder Clay overlies geology within the valleys of the north, with peat within the upland areas. Land-use mainly grasslands along river valley with the remainder heather and moorland. Catchment rises to the summit of Helvellyn. No catchment changes known.
The station
Opened December 1971 as a velocity area station located between Derwent (upstream) and Bassenthwaite (downstream) lakes. Non-standard shallow V weir installed in March 1993.
How it measures flow
Initially, a mobile gravel shoal immediately downstream acted as a control, with bank stability provided by wooden shuttering. This was not stable and a trench-piled non-standard shallow V weir was installed in March 1993 with bank stability provided by stone embankments. The station may be bypassed a little before the bankfull level at the station - roughly, a little above QMED. Bypassing is significant in the larger floods. Station has permanent cableway. Shifting ratings particularly at the low end. Results also appear reasonable in relation to Ouse Bridge downstream, allowing for attenuation. Mean daily flows have multiple ratings before weir construction, one thereafter. For peak flows, ratings simplified to separate (though similar) ratings before and after weir construction. Rated inbank by current meter to approximately 2.6m and out of bank by hydraulic model. Significant out-of-bank flow and hysteresis at the very largest events. Two peak flow ratings across period of record.
Flow regime
Regime affected by controlled releases from Derwent Water and spill and controlled releases from Thirlmere reservoir.
The flow record
No data after the 5th December 2015 due to rating changes during/following storm Desmond. Re-rating following temporary closure ongoing. Full period of record peak flow data reviewed and released in August 2024 (WINFAP Files v13).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Velocity–area
Operating since
1972
Station datum
72.6 mAOD
Flow record
1972–2015 · 43 yrs · 100% complete
Peak-flow record
since 1971
Hydrometric area
75
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Rain upstream
This gauge has no rain model of its own, but it usually follows Southwaite Bridge: when about 10mm of rain falls near Southwaite Bridge in 6h, this gauge usually starts rising about 75 minutes later.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Derwent at Portinscale flooding today?
The current level is 0.67m, which is within the typical range of 0.31 to 1.33m. Flooding is unlikely at this level.
Is the river level rising or falling at Portinscale?
Based on the most recent readings, the level is currently falling slightly. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
Why is the level slowly falling?
When little or no rain has fallen for a while, a river level gradually drops as the water stored in the ground and soil drains away with nothing to replace it. This is called baseflow recession and is normal in dry spells. Only about 0.0mm of rain has fallen nearby in the last 7 days, so the flow is being sustained mainly by groundwater. A gentle decline like this is expected and is not a sign of a problem — downstream gauges often recede a little faster than headwaters further upstream, and levels recover once rain returns.
What is a normal level for the River Derwent at Portinscale?
The typical range at this station is 0.31m to 1.33m, based on Environment Agency historical data. Levels above 1.33m 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: