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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
Height for "Above a height"
Drag the line on the chart, or type a value:mASD
Quick pick:
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.
Get notified when recent rainfall near this gauge crosses its learnt rise trigger — an early "watch"
signal, typically hours before a rise. Experimental; not an official flood warning.
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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
0.057 mASD
▬ Steady
24h Max
0.069 mASD
24h Min
0.056 mASD
Typical Range
0.04 - 0.75
mASD
Highest Recorded
1.66 mASD
EA official record
1.66 in our data (since Oct 1979)
Current level is 3% of this
ⓘ
Flood alert
The Essex coast from Clacton to and including, St Peters Flat and the Colne and Blackwater estuaries
High tides today may lead to flooding.
Flooding is possible from 11:15am to 1:15pm on Saturday 10th October.
Clacton Promenade, Lee-over-Sands and Brightlingsea sea front may see some wave overtopping and spray. The Strood at Mersea Island, Coast Road and car parks on the front at West Mersea, and the Hythe and Promenade at Maldon may be flooded. The detailed forecast is for a peak level at Clacton of 2.77 mAODN at 12:15pm, on Saturday 10th October, which is 0.28m above tide tables, Wind Force 5, Westerly. Tides will remain high over the next couple of days.
We are closely monitoring the situation .
Avoid coastal roads, footpaths and carparks, which may be flooded.
This message will be updated by 5:00PM on Saturday 10 October or as the situation changes.
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 8 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
None of the storm overflows FloodRadar holds is traced upstream of this gauge on the mapped river network. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow. Those nearby are listed below.
Nearby, connection not known
Within 6 km in a straight line, but the river map cannot say whether their water passes this gauge.
Anglian Water · into The River Wid · 5.5 km away in a straight line · its watercourse is not on the river map
0 spills · 0 hours in 2025
Not discharging now · last
2 more within 6 km whose connection is not known.
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 0.75 m
on about 8 days.
This year so far: 6 days.
20266 days, 5 of them high · 5 highso far
20253 days, 3 of them high · 3 high
202411 days, 10 of them high · 10 highpatchy data
202313 days, 12 of them high · 12 high
20220 days patchy data
202111 days, 10 of them high · 10 highpatchy data
20209 days, 9 of them high · 9 high
20195 days, 4 of them high · 4 highpatchy data
20183 days, 1 of them high · 1 highpatchy data
20171 day, 1 of them high · 1 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 0.81 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2007 for the 6 flood
areas linked to this gauge (nearest 1.2 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 Sandon 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.
🌊 FlashyRain runs off fast — levels rise and fall sharply, often within hours of 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
0.28
flashy — rain runs off fast
Avg Annual Rainfall
596 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
2.6%
largely rural
Median Annual Flood
8.98 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
17.20 m³/s
23 Jun 2016 · 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.
Insensitive 'Essex' profile weir gauging a rural catchment with reservoirs affecting the regime.
More detail
The catchment
Catchment area includes 13.7 sq km draining to Hanningfield Reservoir 10km upstream. London Clay with sand and gravel over high ground in northeast, Boulder Clay in south. Rural, mainly arable land with some grassland.
The station
'Essex' profile (modified Flat V Crump) weir with crest tapping.
How it measures flow
Insensitive. One peak flow rating applied across period of record. Modular limit around 0.6m. All but highest flows contained. The flow is derived through the rating curve and then under non-modular conditions, a macro is applied within WISKI which applies a reduction factor. Therefore, under high flows, the stage and flow won't match through the modular rating. Subject to weed growth and siltation, particularly downstream.
Flow regime
Reservoir(s) in catchment affect runoff. Naturalised flows (1963-1976) account for reservoir compensation water (0.011 cumecs) and storm overflows. Minor additions from industrial effluent.
The flow record
No POT data are presented for this station as they have no non-modular flow correction applied. AMAX data have been corrected. Some float-run gaugings are thought to be unreliable. Full period of record peak flow data reviewed and released in August 2021 (WINFAP Files v10).
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the Sandon Brook at Sandon Bridge flooding today?
The current level is 0.06m, which is within the typical range of 0.04 to 0.75m. Flooding is unlikely at this level.
Is the river level rising or falling at Sandon Bridge?
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 Sandon Brook at Sandon Bridge?
The typical range at this station is 0.04m to 0.75m, based on Environment Agency historical data. Levels above 0.75m 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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15 Mar 2018 Downstream section
15 Mar 2018 Gauging station structure (looking upstream)
15 Mar 2018 Gauging station structure
27 Nov 2012 Looking downstream of weir in high flows
27 Nov 2012 Looking upstream in high flows
27 Nov 2012 Weir non-moduar in high flows
3 May 2012 US of weir high flows, stage 0.711m
29 Aug 2001 Weir
