Land on which the sanctuary is situated was acquired in a number of ways. In 1962, a Sydney accountant, Carmen Coleman, discovered this interesting area of remnant bush where Europeans at Bargo made the first sightings of
koala and
lyrebird. Carmen Coleman donated the parcel of land at Bargo to the David G. Stead Memorial Wildlife Research Foundation, which was established in 1963 to perpetuate the memory of David Stead who was a pioneer of nature conservation in Australia. The National Trust began its association with the Stead Foundation and the Sanctuary in 1963. Wirrimbirra was gifted to the National Trust (NSW) by the David G. Stead Memorial Wildlife Research Foundation in 1965. The property was leased to the Foundation for several terms up to the present time. Recently a small portion was separately leased to the Australian Native Dog Conservation Society. A comprehensive Conservation Agreement with the
NSW Office of Environment and Heritage has been developed for the Wirrimburra Sanctuary to ensure that the native vegetation is managed and conserved in perpetuity. In late 2015 the National Trust of Australia (NSW) classified the Bargo Gorge Landscape Conservation Area. == Description ==