RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Colne

Largest measured brown / sea trout: 39.9 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Colne was 39.9 cm, recorded at Lees Mill lane on 30 August 2007.

Across 1,178 measured brown / sea trout, the median measured length was 10.6 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 brown / sea trout records across England →

Most recent observation27 August 2025Lees Mill lane · 3 fish
Largest measured brown / sea trout
39.9 cm
Median length
10.6 cm
Fish measured
1,178
Survey locations
10

Individual EA measurements

Largest measured brown / sea trout

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

LengthSurvey dateSurvey locationSurvey ID
39.9 cm30 Aug 2007Lees Mill lane108407
37.5 cm22 Jul 2013Holme Mills139682
37.4 cm27 Sept 2005Lees Mill lane87739
36.4 cm27 Sept 2005Lees Mill lane87739
35.9 cm30 Aug 2007Lees Mill lane108407
35.8 cm30 Aug 2013Lees Mill lane138498
35.6 cm30 Aug 2007Lees Mill lane108407
35.5 cm29 Aug 2023Lees Mill lane163096
35.5 cm30 Aug 2007Lees Mill lane108407
35.4 cm16 Sept 2019Lees Mill lane155465

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

Explore the river

Where brown / sea trout were found

Each point marks a survey location with at least one brown / sea trout 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 brown / sea trout
Lees Mill lane23 Sept 200327 Aug 202514
Clough Lea17 Sept 200914 Oct 20213
Holme Mills17 Sept 200926 Aug 20153
Stafford Mills25 Aug 201525 Aug 20151
Galpham Stadium13 Aug 201513 Aug 20151
Stoney Battery Lane4 Aug 201222 Jul 20132
Titanic Mill4 Aug 20124 Aug 20121
Slaithewaite park footbridge4 Jun 20104 Aug 20122
DS Slaithewaite Park4 Jun 20104 Aug 20122
Pollard Street23 Sept 200323 Sept 20031

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

2003–2025

Survey records by year

Each bar shows how many survey visits recorded brown / sea trout that year.

Fish measured by surveyors

Measured length distribution

See how the 1,178 measured fish were spread across different length ranges.

Smallest
5 cm
Lower quarter
8.2 cm
Median
10.6 cm
Upper quarter
17.7 cm
Largest
39.9 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.

Stone loach Grayling 3-spined stickleback Minnow Bullhead

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 →