RiverFish

Roach · Rutilus rutilus

Roach in the Lee Navigation

Largest measured roach: 35.7 cm

The largest roach measured in Environment Agency surveys of the Lee Navigation was 35.7 cm, recorded at Amwell Quarry on 1 October 1992.

Across 12,138 measured roach, the median measured length was 9.9 cm.

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

See roach records across England →

Most recent observation16 September 2025Upstream Carthagena Lock · 11 fish
Largest measured roach
35.7 cm
Median length
9.9 cm
Fish measured
12,138
Survey locations
35

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
35.7 cm1 Oct 1992Amwell Quarry116012
34.6 cm1 Oct 1992Amwell Quarry116012
33.6 cm15 Dec 1992Hertford Basin115984
31.9 cm1 Oct 1992Amwell Quarry116012
30.5 cm4 Jul 1978Hartham channels & Lee Nav confluence116731
30 cm9 Jul 2024Picketts Lock166554
29.6 cm4 Jul 1978Hartham channels & Lee Nav confluence116731
29.1 cm4 Jul 1978Hartham channels & Lee Nav confluence116731
27.3 cm4 Jul 1978Hartham channels & Lee Nav confluence116731
26.7 cm1 Sept 2004Enfield Lock81935

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
Upstream Carthagena Lock16 Sept 202516 Sept 20251
Enfield Lock22 Oct 20027 Aug 202518
Ponders End29 Nov 19785 Aug 202517
Picketts Lock16 Mar 199310 Jul 202518
Hertford Basin15 Dec 19928 Jul 202513
Enfield Lock TowPath27 Sept 201827 Sept 20181
Enfield Lock ReedBeds27 Sept 201827 Sept 20181
Dobbs Weir12 Oct 200722 Jun 20153
u/s Springfield Marina3 Oct 20133 Oct 20131
Lea Bridge22 Jul 201322 Jul 20131
Rye House26 Apr 197830 Mar 20123
Rye House to Fieldes Weir30 Jun 201130 Jun 20111
Fieldes Weir to Dobbs Weir lock30 Jun 201130 Jun 20111
Stanstead Lock to Hardmead Lock29 Jun 201129 Jun 20111
Rye House to Stanstead Lock29 Jun 201129 Jun 20111
Hardmead Lock to Ware Lock29 Jun 201129 Jun 20111
Hertford Lock to Ware Lock28 Jun 201128 Jun 20111
Enfield Lock (OAP Fishing Match)1 Aug 20074 Aug 20104
Tottenham Lock7 Oct 20097 Oct 20091
Ware Priory5 Nov 199220 Aug 20097
Springwell Marina10 Oct 200710 Oct 20071
Springfield Marina, Hackney25 Feb 199325 Feb 19931
Hardmead (Amwell End)23 Feb 199323 Feb 19931
Fieldes Weir to Dobbs Weir19 Apr 197818 Feb 19932
Crown Fishery (Dobb's Lock + Carthagena)5 Feb 19935 Feb 19931
Small Lee, Prince of Wales fields2 Feb 19932 Feb 19931
Waltham Abbey Marsh22 Nov 197826 Nov 19922
Kings Meads Fields10 Nov 199210 Nov 19921
Coppermill Stream3 Nov 19923 Nov 19921
Amwell Quarry1 Oct 19921 Oct 19921
Tumbling Bay22 Sept 199222 Sept 19921
Marshgate Drive (Dicker Mill Stream)17 Sept 199217 Sept 19921
New Gauge4 Jul 19784 Jul 19781
Hartham channels & Lee Nav confluence4 Jul 19784 Jul 19781
Stanstead Lock Upstream5 Apr 19785 Apr 19781

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

1978–2025

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 12,138 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
7.5 cm
Median
9.9 cm
Upper quarter
13 cm
Largest
35.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Lee Navigation

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

Perch Pike Chub Bleak Tench Common bream

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 →