13. Eel Passage at Nazeing Marsh

Themes: Ecology and morphology

A small concrete weir was notched to enable eel migration in the Lower Lea catchment.

The project was delivered in 2018 as part of the Slimy Wrigglers action plan, aiming to make the Lower Lea fully permeable to migrating eels.

A small brook running between Holyfield Lake and Nazeing Marsh, was identified as being suitable to support eel migration, linking to a previous project to install eel passes at Holyfield Weir enabling their migration into the lake.

Notching the weir on the small brook opened up 1.4km of channel, bypassing the Kiora Radial Gates at the top of Holyfield Lake – which was the next impasse to migration – and connecting into the next wetland complex at Nazeing.

4. Invasive Non-Native Species Control

Themes: Ecology and morphology

This project aims to eradicate invasive non-native species (INNS) from the catchment. Read more ...

11. Improving habitats along the Cobbins Brook

Themes: Ecology and morphology

This project aims to improve the riparian habitat along the Cobbins Brook, a tributary of the River Lea. Read more ...

12. Rewilding the Turkey Brook

Themes: Ecology and morphology

Enfield Council are improving natural habitats along the Turkey Brook. Read more ...

6. River Lynch Restoration

Themes: Ecology and morphology

Restoration of the River Lynch at Dobbs Weir, Hoddesdon to a naturally functioning chalk stream. Read more ...

9. Old River Lea Barbel Project

Themes: Ecology and morphology

A special interest group has formed to identify and address issues on the Old River Lea affecting barbel.  Read more ...

7. Install two eel passes at Holyfield Weir

Themes: Ecology and morphology

Install two eel passes on Holyfield Weir to allow eels access to good quality habitat in Holyfield Lake. Read more ...

3. Conserving Slimy Wrigglers

Theme: Education and monitoring; Ecology and morphology

The project aims to make it easier for eels to migrate through the Lea Catchment, from the Thames to Welwyn Garden City. Read more ...

2. Riverfly Monitoring Initiative

Theme: Education and monitoring; Ecology and morphology

Establishing Riverfly Monitoring along the Lower Lea. Read more ...

8. River Lee Restoration Kings Weir through Fishers Green

Theme: Water quality; Ecology and morphology

This project aims to improve a section of the old River Lea through Kings Weir Fishery and Fishers Green. Read more ...

10. Restoring the Cornmill Stream and Meadows

Themes: Ecology and morphology

This project aims to improve the hydrology and habitats of the Cornmill Stream and Cornmill Meadows SSSI. Read more ...

1. Lea Tributaries Catchment Walkover

Themes: Education and monitoring

This project aims to assess the habita quality and condition of the smaller tributaries that feed the River Lea. Read more ...

1. Riparian Rights and Responsibilities

Themes: Education and monitoring

This project aims to improve riparian landowner understanding of their rights and responsibilities and stimulate action for the river. Read more ...

5. Glen Faba Reedbed Creation

Themes: Ecology and morphology

This project aimed to create a new area of reedbed at the northern end of Glen Faba Lake in the Lee Valley Regional Park. Read more ...