BlueScope Steel is building a green and golden bell frog rehabilitation area at Port Kembla to reverse some of the damage done to the creature's habitat over the past century.
The two large ponds and landscaped gardens will act as a sanctuary - and hopefully breeding ground - to two endangered frog populations at Cleary Bros on Five Islands Rd and the Brick and Block site on Foreshore Rd.
The garden is expected to open to frogs in September. It was designed by Dan Deighton in consultation with ecologist Garry Daly, the Department of Environment and Climate Change's Paul Wearne and BlueScope's Robynne Murphy.
"Our objective is to try and enhance habitat and create some more breeding ponds and actually build up the number of frogs so they are stable because they are still in decline," Mr Daly said.
"The critical thing is that we are going to allow the ponds to dry out each year in winter and then fill them in time for the breeding season so the frogs will come in and it will be ready for them without any predators."
Ms Murphy said the ponds would be fenced to protect them from foxes and feral cats and raised to hinder access for eels, which eat frog spawn.
The habitat is part of BlueScope's five-year pollution reduction program - part of its environmental licence with the department. Along with BlueScope, Veolia, Hatch and Civil have also contributed funds towards the habitat's creation.