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GRP Mammal Ledges

In partnership with the Staffordshire Alliance, our GRP mammal ledges and shelves are now part of the West Coast Mainline upgrade.


Meeting sensitive environmental requirements, mammal boards (also known as a culvert mammal ledge) allow wild animals such as otters, badgers and other wildlife types, a safe passage under bridges. GRP is the perfect material for damp environments, as it provides a long lasting, maintenance-free solution.


Rail & Road

Product Types

GRP Mammal Ledges (Mammal Shelves) Anti-Slip

£250m upgrade to the West Coast Main Line – delivered under budget over a year ahead of schedule.


Staffordshire Alliance included Laing O’Rourke, Network Rail, Atkins and Volker Rail. It was the industry’s first pure construction alliance and won the Collaborative Working accolade at the UK Railway Industry Awards in 2016 as well as Outstanding Project (over £20m) at the UK Railway Industry Awards in 2017.

The £250m upgrade to the West Coast Main Line includes 10 kilometres of new line and was delivered under budget over a year ahead of schedule.

In addition to a larger package of works for GRP safety handrails around bridges and parapets, we also fabricated and installed these runs of mammal ledges under Norton Bridge on the West Coast Main Line. To ensure environmental standards, mammal boards are required to allow wildlife, in this case, otters, to pass under bridges rather than being forced up onto the railway line. It is understood that otters do not like high flows under bridges and instead, instinctively head over the bridge which can result in injury or death.

Mammal boards, also known as mammal ledges or otter ledges are required to be 45cm to 60cm wide and 15cm above the highest flood level. Headroom of at least 60cm allows otters to easily use these culverts. To enable the animals a good grip on the surface, it must be rough and therefore, GRP Anti-Slip is an ideal practical solution. As glass reinforced plastic doesn’t require any maintenance and is long-lasting, even in wet and damp environments, it is the perfect material for culvert mammal ledges.

Click here for more information on our Anti-Slip surfaces.

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Evergrip Limited

Flaxley Road, Selby, North Yorkshire
YO8 4BG United Kingdom

PHONE: 01757 212744
Company Registered Number: 04186772
Registered for VAT Number: GB 773 5346 10

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27th March 2020

We are open for business

Covid 19 - Confirmation Statement

We would like to reassure all customers and enquirers that we remain open for business, while carefully following Government guidelines issued here:

The majority of our administration staff are working remotely and we have rostered production staff to make numbers available to meet demand.

We are able to provide the full range of our standard products from stock to serve any ongoing requirements you may have and will be pleased to receive any invitations to quote for future projects.

At the present time, in accordance with social distancing regulations we will not be conducting face to face meetings with business partners until further notice. However it may be possible to arrange video link meetings if required, please contact us for further information.

Collections of orders from our workshops are possible, by prior arrangement only please and visitors are reminded to observe the standard 2m distancing rules, for the safety of all.

Our transport partners are all providing us with a normal service.

We will update this statement if required and following any further guidance issued by the UK Government.

We wish you well.