The reserve is in two sections, separated by 1.5 kilometres of cleared grazing and cropping country. The western section (Coolbaggie West – 1042 hectares) is bisected by Hains Road and Coolbaggie Forest Road, and is bounded to the east by Coolbaggie Creek. The eastern section (Coolbaggie East – 733 hectares) is adjacent to the western boundary of Goonoo National Park. Western Boundary Trail is within Goonoo National Park.
Over 88 native animal species have been recorded in the reserve, including 4 threatened species: glossy black-cockatoo, speckled warbler, little lorikeet and malleefowl. The reserve has a small and locally rare population of the yellow-plumed honeyeater, which is at the north-east edge of its range in Australia. Ten vegetation communities have been identified in the reserve including two mallee communities that are rare in the Dubbo area, and 2 communities that may form part of the following endangered ecological communities listed under the NSW Threatened Species Conservation Act 1995:
- Fuzzy Box Woodland on Alluvial Soils of the South Western Slopes, Darling Riverine Plains and Brigalow Belt South Bioregions
- Inland Grey Box Woodland in the Riverina, NSW South Western Slopes, Cobar Peneplain, Nandewar and Brigalow Belt South Bioregions.
The reserve also contains 2 threatened plant species: Homoranthus darwinioides (a small shrub) and Tylophora linearis (a vine).
Public exhibition of this document was held from 25 August 2017 to 27 November 2017.