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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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EA/SEPA/NRW data and are best-efforts. Terms
Current Level
0.319 mASD
▬ Steady
24h Max
0.327 mASD
24h Min
0.319 mASD
Typical Range
0.30 - 3.00
mASD
Highest Recorded
4.47 mASD
EA official record
3.98 in our data (since Jun 1956)
Current level is 7% 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.
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.
38 storm overflows are traced upstream of this gauge, the nearest 980 m away along the river. 0 report discharging now, 35 report not discharging, and for 3 the monitor is offline or has not reported, so their status is not known.
South West Water · into Trib Of River Tamar · 5.4 km away in a straight line · no mapped watercourse close enough to be sure
72 spills · 1,067 hours in 2025
Not discharging now · last
1 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. Explore the sewage map →
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 Gunnislake 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.
🌊 Fairly flashyResponds fairly quickly to rain, with moderate baseflow between events.
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
0.48
mixed response
Avg Annual Rainfall
1,319 mm/yr
1991–2020 · +6% since 1941–70
Urban Extent
0.5%
largely rural
Median Annual Flood
263 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
484 m³/s
27 Dec 1979 · 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 with a wide shallow channel and rocky bed.
More detail
The catchment
A fairly responsive rural catchment of moderate relief, draining very disturbed Lower Carboniferous slates, shales, grits and volcanics. Significant alluvial flats in middle reaches, Devonian slates lower down. Land use is a range of agriculture, grazing and forestry. Construction of Roadford Reservoir on the River Wolf in 1988.
The station
Velocity area station with a wide, shallow channel and rocky bed. Cableway span is 46.9m. New cableway in 1999. Informal Flat V low flow level bed control installed in 1989. Access problem at high flows.
How it measures flow
Low flow check gaugings undertaken at narrower site. Shifts in rating pre-1989 due to changes in natural bed control. Good range of gaugings, reliable rating especially since 1991. Construction of Roadford Reservoir on the River Wolf may have significant effect on low flows from 1989. Multiple peak flow ratings applied across period of record. Ratings fit well to corresponding gaugings.
Flow regime
Roadford Reservoir from 1989 may have significant effect at low flows. Abstraction for public water supply and industrial/agricultural uses. Some effluent returns. Regulation from surface water and/or groundwater.
The flow record
Full period of record peak flow data reviewed and released in September 2019 (WINFAP Files v8) and 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
1956
Station datum
8.2 mAOD
Flow record
1956–2024 · 68 yrs · 100% complete
Peak-flow record
since 1956
Hydrometric area
47
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 Werrington: when about 10mm of rain falls near Werrington in 6h, this gauge usually starts rising about 3 hours later.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Tamar at Gunnislake flooding today?
The current level is 0.32m, which is within the typical range of 0.30 to 3.00m. Flooding is unlikely at this level.
Is the river level rising or falling at Gunnislake?
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 Tamar at Gunnislake?
The typical range at this station is 0.30m to 3.00m, based on Environment Agency historical data. Levels above 3.00m 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:
FloodRadar
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6 Sep 2013 Gunnislake hut and cableway from right bank
6 Sep 2013 Looking downstream on 06-Sep-2013, Stage = 0.255m, Flow = 1.9 cumec
6 Sep 2013 Looking upstream on 06-Sep-2013, Stage = 0.255m, Flow = 1.9 cumec
24 Nov 2006 Gunnislake high flow gauging on 25 November 2006 @13:47, SG = 2.9m
5 Jun 2003 Gunnislake low level bed control on 5 June 2003 @ 12:00 GMT, SG = 0.396m
Conditions during 30/10/00 event, stage 3.984m