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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
3.322 mASD
▲ Rising
24h Max
3.322 mASD
24h Min
3.260 mASD
Typical Range
3.28 - 4.00
mASD
Highest Recorded
4.61 mASD
EA official record
4.61 in our data (since Oct 1997)
Current level is 72% 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 8 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.
71 storm overflows are traced upstream of this gauge, the nearest 1.1 km away along the river. 0 report discharging now, 69 report not discharging, and for 2 the monitor is offline or has not reported, so their status is not known.
South West Water · into River Exe Via Sws · 50 m away in a straight line · too close to the gauge to say which side
28 spills · 48 hours in 2025
Not discharging now · last
50 more within 6 km whose connection is not known.
5 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 Exeter flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 9 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
0.56
mixed response
Avg Annual Rainfall
1,174 mm/yr
1991–2020 · +3% since 1941–70
Urban Extent
1.2%
largely rural
Median Annual Flood
264 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
351 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.
Land Cover (2023)
Woodland 10%Grassland 72%Arable 14%Urban 3%
Flow affected by: surface-water abstraction, reservoir influence, public water supply, groundwater abstraction, effluent returns, industrial / agricultural abstraction.
Photos
Gauging-station photographs from the National River Flow Archive (UKCEH).
Ultrasonic station at Exeter Quay approximately 300m upstream of the actual 'Trews Weir' structure.
More detail
The catchment
The Exe headwaters drain Exmoor. Geology predominantly Devonian sandstones and Carboniferous Culm Measures, with subordinate Permian sandstones in the east. Moorland, forestry and a range of agriculture. No major catchment changes. The Culm rises in the Blackdown Hills. Headwaters drain Greensand and Gault Clay. Predominantly Permo-Triassic sandstones, breccias and marls with extensive valley gravels and alluvium. The catchment has a subdued relief and is predominantly agricultural; the largest settlement is Cullompton. Small areas of woodlands in the east. No major catchment changes.The Creedy is a v-shaped catchment draining moderate to high relief valleys to the N and W. Predominantly Culm Measures, sandstones and shales with some Permo-Triassic breccias and sandstones near Crediton. Low grade agriculture, grazing and forestry. No major catchment changes.
The station
Ultrasonic station at Exeter Quay approximately 300m upstream of the actual 'Trews Weir' structure. Channel about 45m wide. Initially built for Water Resources, but now multifunctional. Station added to peak flows dataset in October 2018 (WINFAP Files v7).
How it measures flow
The performance of the gauge has improved over time with upgrades to the ultrasonic equipment. Limited bypassing at high flows. Very low velocities during periods of low flows have historically caused some performance issues. There is a lot going on here, with the mouth of Exeter Canal feeding from the weir pool, as well as Trews Weir Radial gate, bypass channel, fish pass and 'overspill weir' to the flood relief channel all having an impact on the regime. The level of the 'overspill weir' to the flood relief channel was lowered in 2015. The gauge has sustained damage during high flow events - most notably in the October 2000 floods.
Flow regime
Wimbleball Reservoir in catchment affects runoff. Runoff also reduced by other public water supply abstraction. Runoff influenced by groundwater abstraction/recharge. Runoff increased by effluent returns. Runoff reduced by industrial/agricultural abstraction. Moderate surface and groundwater abstractions affect low flows.
The flow record
According to EA, level data and few gaugings with one poor rating available from 09-78 to 09-81. Site closed as considered unsuitable for stage-discharge rating (due to weir, flood gates, boat traffic, canal offtake, etc.). 15 minute record is variable at first (though daily means could be reasonable) but record improves over time. Site damaged in 10-2000 flood and loses flow subsequently to 08-2001. Site upgraded at end 2006 and now much better.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Ultrasonic
Operating since
1996
Station datum
5.2 mAOD
Flow record
1996–2024 · 28 yrs · 100% complete
Peak-flow record
since 1997
Hydrometric area
45
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Frequently asked questions
Is the River Exe at Trews Weir flooding today?
The current level is 3.32m, which is within the typical range of 3.28 to 4.00m. Flooding is unlikely at this level.
Is the river level rising or falling at Trews Weir?
Based on the most recent readings, the level is currently rising. 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 Exe at Trews Weir?
The typical range at this station is 3.28m to 4.00m, based on Environment Agency historical data. Levels above 4.00m 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:
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20 Nov 2016 Flood relief channel overspill weir DS of gauge
20 Nov 2016 Trews Weir viewed from DS, DS of gauge location
23 Dec 2012 Looking DS to gauge location
23 Dec 2012 Gauge location at 4.67m
25 Nov 2012 Looking US from gauge 4.57m
25 Nov 2012 Looking DS past gauge to weirs 4.42m
25 Nov 2012 Looking US from gauge 4.56m