The transformation into an ecological site has been ongoing since Otley sand and gravel quarry closed in 1996.

The 13.7 hectare nature reserve now has a conservation lake, native woodland, scrub, hedgerows, reedbeds and grassland and is home to a number of protected animals and plants including the song thrush, bullfinch, grey partridge, common starling and common toad.

There are also good numbers of dragonflies and butterflies, and otters are recorded there regularly.

The work was carried out by owner Hanson, in partnership with Leeds City Council, Otley Town Council and the Otley Wetland Nature Reserve Trust (OWNRT).

Representatives from Hanson and OWNRT were presented with the Quarry Products Association's 2008 restoration award by Graham Wynne, chief executive of the RSPB, at a ceremony in London.

Peter Riley, chairman of the OWNRT, said: "The success of this nature reserve is a tribute to partnership working. The Trust is grateful in particular for all the co-operation and practical help received from Hanson, local councils, Wharfedale Naturalists Society, Nidderdale AONB and last but not least our wonderful and ever-willing team of volunteers."

Hanson land and planning manager Ben Ayres said: "It is fantastic to think that this site now acts as a safe haven for wildlife. The transformation from a working quarry to outstanding nature reserve will have lasting social and environmental benefits for the local community.

"We are grateful for the input of the OWNRT and also to the town council and local volunteers who have helped make the restoration of Otley quarry such a success."

Access to Otley nature reserve is available to permit holders. Permits cost £5 a year (refundable for active voluntary work) and are available from Peter Riley on (01943) 862916.