Case study:Chester Weir Notch

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Catchment

River basin district	Dee
River basin	Middle Dee

Subcatchment

River name	Dee - Chester Weir to Ceiriog
Area category	1000 - 10000 km²
Area (km2)
Maximum altitude category	100 - 200 m
Maximum altitude (m)	136136 m <br />0.136 km <br />13,600 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Improved grassland
Waterbody ID	GB111067057080

Other case studies in this subcatchment: Erbistock Weir Removal, LIFE Dee River, QUERCUS Dee, River Dee

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Location: 53° 11' 11.08" N, 2° 53' 12.98" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries
Country	Wales
Main contact forename	Josh
Main contact surname	Robins
Main contact user ID	User:JoshRRC
Contact organisation	Natural Resources Wales
Contact organisation web site
Partner organisations
Parent multi-site project	Case_study:LIFE Dee River
This is a parent project encompassing the following projects	No

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Project summary

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In partnership with the Environment Agency, the aim of the work was to improve downstream passage for young salmon and sea trout as part of the multi-million-pound LIFE Dee River project, led by Natural Resources Wales (NRW). Located at the tidal limit of the Dee, Chester weir is 150 metres in length and 3 metres high. An existing canoe and fish gate was in place in the weir crest that had not functioned for over 20 years. Prior to the work, young fish were often delayed on their downstream journey by the weir, particularly at low flows in the spring when there was not enough water to help them pass over the structure. Unable to swim over such a large man-made barrier, fish would congregate above the weir and were more vulnerable to predation from birds and larger fish. Work to dismantle the existing gate and surrounding structure was carried out during low tides by experienced local contractors, using a pontoon to transport materials across the river. A new, specially fabricated stainless-steel gate was installed which is operated by a winch on the bank, allowing it to be opened and closed easily at key periods throughout the year.

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