RiverFish

Roach · Rutilus rutilus

Roach in the River Colne

Largest measured roach: 35.1 cm

The largest roach measured in Environment Agency surveys of the River Colne was 35.1 cm, recorded at Chalkney Mill on 17 April 1984.

Across 29,013 measured roach, the median measured length was 11.6 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Colne.

See roach records across England →

Most recent observation16 June 2026Blue Bridge · 4 fish
Largest measured roach
35.1 cm
Median length
11.6 cm
Fish measured
29,013
Survey locations
31

Individual EA measurements

Largest measured roach

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
35.1 cm17 Apr 1984Chalkney Mill13887
35 cm23 Sept 1987Blue Bridge13914
34.5 cm15 Apr 1996Castle Park13973
34.2 cm10 Aug 1993Castle Park13948
34.2 cm24 Aug 1990Swanscombe Farm13935
34.2 cm12 Aug 1987Swanscombe Farm13909
34.1 cm4 May 1984Nunnery Bridge13895
34 cm19 Apr 2007Earls Colne FGS105111
34 cm13 Sept 1993Alderford Mill13969
33.9 cm10 Sept 1987Brook Street Farm13917

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where roach were found

Each point marks a survey location with at least one roach record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding roach
Blue Bridge12 Apr 198416 Jun 202613
Nunnery Bridge4 May 198411 Jun 202611
Brook Street Farm10 Sept 198710 Jun 202611
Box Mill11 Apr 19843 Jun 202614
Wakes Colne Viaduct14 Aug 19872 Jun 202620
Fordstreet11 May 198414 May 202614
Spring Lane16 May 19847 May 202620
Earls Colne FGS19 Aug 19876 May 202620
Cooks Mill18 May 198428 Apr 202614
Downstream New Bridge17 May 19848 Jun 202310
Broom House21 Aug 19877 Jun 20239
Chalkney Mill17 Apr 19842 Jun 202312
Cricket Ground28 Jul 198724 May 202318
The Hedinghams8 May 198428 Jun 201711
North Bridge29 Jul 198729 Apr 201417
Upstream A12 Bridge (Silver eel)30 Nov 20114 Jan 20124
Lexden FGS Downstream (Silver eel)30 Nov 20118 Dec 20113
Maplestead Mill10 Apr 19848 Jun 201110
Poole Street28 Sept 198719 Jun 20087
Swanscombe Farm12 Aug 198718 Jun 20088
Alderford Mill11 Sept 198713 Jun 20087
Halstead24 Sept 198710 Jun 20086
Earls Colne Mill16 Apr 19846 Jun 20089
Elms Hall20 Aug 19875 Jun 20086
Fiddlers Mill11 Aug 19872 Jun 20087
Upstream A12 Bridge21 May 198413 May 20089
Bathing Pool22 May 19849 May 20088
Castle Park23 May 19847 May 20089
Great Porters Farm22 Sept 199322 Sept 19931
Upstream Blue Bridge17 Sept 199016 Sept 19932
Does Corner19 Sept 199019 Sept 19901

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

1984–2026

Survey records by year

Each bar shows how many survey visits recorded roach that year.

Fish measured by surveyors

Measured length distribution

See how the 29,013 measured fish were spread across different length ranges.

Smallest
1.1 cm
Lower quarter
8.3 cm
Median
11.6 cm
Upper quarter
15.3 cm
Largest
35.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Colne

Compare other species with enough survey and measurement data for a detailed page.

European eel Gudgeon Dace Pike Perch Stone loach

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →