Detailed design and licence application for removal of the Mill of Eden Weir

The Mill of Eden weir is restricting access for Atlantic salmon, trout and eel. Removing it will open up access to over 11 km of habitat.

Introduction

The Deveron River is a celebrated salmon, sea trout and brown trout fishery and is one of the top salmon fisheries in Scotland. The Deveron is situated in Northeast Scotland within the counties of Aberdeenshire and Banffshire and has an overall catchment area of 1266 kmĀ² (489 miles2) and a length of 96 km (60 miles). The Mill of Eden Weir is situated on a tributary of the lower Deveron named the King Edward.

At a glance

CountryScotland
RiverDeveron
Km to be opened11
Focal speciesAtlantic salmon, brown/sea trout and eel
Project typeDam removal (pre-demolition)
Project statusLive

Project context and opportunity

Road culverts, weirs, bridge aprons or excessive natural large woody debris accumulations can cause barriers to fish migration. Not only can they stop or delay adults in returning to their spawning streams, but they can stop or delay downstream migrating juveniles and smolts and lead to pinch points where they are more vulnerable to predation. Some barriers, although passable under the right conditions, can become temperature barriers when water temperature limits the physical ability of the salmon to navigate the barrier. The barrier in this project is an old stone mill weir that is 1.2m high and 11m wide. The old weir was previously used to supply water to an old corn mill downstream.

Project aims

The Mill of Eden weir is restricting access for Atlantic salmon, trout and eel, and by removing the weir, the project team will open up access to over 11 km of habitat. In this project, the team will take the steps needed to prepare for dam removal, including conducting field surveys, a geomorphic assessment, a topographic assessment, sediment sampling, a hydrological assessment and hydraulic modelling, and a flood risk assessment.

Partners

The Deveron, Bogie & Isla Rivers Charitable Trust & River Deveron District Salmon Fishery Board