The project facilitated by the Rottnest Island Authority, a steering committee and volunteer groups is among four finalists in the Managing the Environment category.
The Wadjemup Walk Trail comprises more than 42km of walkway over five sections and the first part – the West End Boardwalk – opened in 2012 with the final section due to be completed next year.
Rottnest Foundation chairman Jeff King said it was a “prestigious feather in the cap” just to be nominated for the award.
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“A lot of work has gone in to the project from lots of different volunteer groups which is one of the highlights of the whole project,” the chairman of eight years said.
Volunteer groups included the Rottnest Society, Winnit Club, Rottnest Voluntary Guides Association, Rottnest Island Nursery and Conservation Volunteers Australia.
The Rottnest Foundation has contributed more than $1 million to the project that was also funded by BHP, Lotterywest and Tourism WA.
Mr King said 60,000 seedlings planted along the trail by volunteers were propagated at the Island’s nursery. Winners will be announced on November 2.