RiverFish

Roach · Rutilus rutilus

Roach in the River Cookham - Boulters

Largest measured roach: 29 cm

The largest roach measured in Environment Agency surveys of the River Cookham - Boulters was 29 cm, recorded at Cliveden Island on 1 September 2005.

Across 1,697 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 Cookham - Boulters.

See roach records across England →

Most recent observation27 July 2025Cliveden Island · 15 fish
Largest measured roach
29 cm
Median length
11.6 cm
Fish measured
1,697
Survey locations
3

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
29 cm1 Sept 2005Cliveden Island86178
27.8 cm2 Sept 2003Odney Weir Stream, Cookham.76963
25.8 cm3 Sept 2012Cliveden Island133658
25.4 cm3 Sept 2012Cliveden Island133658
24.3 cm2 Sept 2003Odney Weir Stream, Cookham.76963
23.8 cm1 Sept 2005Cliveden Island86178
23.5 cm5 Sept 2006Odney Weir Stream, Cookham.101412
23.5 cm1 Sept 2005Cliveden Island86178
23.1 cm2 Sept 2003Odney Weir Stream, Cookham.76963
23 cm4 Sept 2007Cliveden Island106693

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
Cliveden Island1 Sept 199827 Jul 202525
Odney Weir Stream, Cookham.1 Sept 20002 Sept 201312
Hedsor Weir Stream Cookham to Boulters1 Sept 20051 Sept 20051

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

1998–2025

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 1,697 measured fish were spread across different length ranges.

Smallest
1.7 cm
Lower quarter
9 cm
Median
11.6 cm
Upper quarter
14.1 cm
Largest
29 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Cookham - Boulters

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

Bleak Perch Pike European eel Dace Chub

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 →