Planning application
DM/2026/00292
Usk Bridge Merthyr Road Llanfoist Monmouthshire
Proposal
The proposal is for the construction of a new fish pass at Abergavenny bridge, Llanfoist. Abergavenny Bridge is orientated perpendicular to flow across the River Usk, with a total length of 62m . The bridge apron, which terminates in a vertical drop which is exposed in low flows, presents a barrier to fish migration . The apron is considered a significant barrier to shad, although they are occasionally observed upstream, as well as other fish species such as lamprey. The shallow apron also delays salmonid passage during low flows, particularly the sloping glacis towards the disused railway bridge abutments. A fish pass has been determined as the best solution to this barrier. The pass will comprise a notch in the concrete apron below Arch 2 (second arch from the true right bank), in which perturbation boulders will be evenly spaced. This will provide an area of deeper, slower flowing water for fish to move through. This is hoped to be particularly beneficial to shad populations, which migrate upstream to spawn during summer (primarily June/July) when river flows are often at their lowest. The bridge, which is owned by Monmouthshire County Council, is a Scheduled Monument and Grade II* listed structure. The proposed works are therefore to be carried out under Scheduled Monument Consent with appropriate archaeological supervision. The proposed design of the new fish pass comprises a ?notch? within the concrete apron. This notch will require the cutting of a channel into the concrete, approximately 3.6m wide and 700-800mm below the existing level. These dimensions have been chosen to ensure that the final level is effective as a fish pass. It was decided that the most appropriate arch to locate the fish pass was Arch 2, so as to optimise hydraulics of the fish-pass and the lower depth of the apron as compared to the other arches, which minimises the depth of excavation. To provide a 5% gradient (and therefore appropriate velocities), the channel will need to
As published by the council, reference DM/2026/00292
Timeline
Dates from the published record
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9 Mar 2026
Received by Monmouthshire
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28 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Monmouthshire for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
About lawful development applications
How this application type works
A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.
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