Throsby and Kenny Broadacre

Where are the Throsby and Kenny Broadacre offset areas?

The offset areas include Throsby North (172 hectares), Throsby East (104 hectares) and Kenny Broadacre (23 hectares). They extend both the Mulligans Flat and Goorooyarroo Nature Reserves in the northern part of the ACT. The offset areas adjoin the Throsby residential development area and are adjacent to the future Kenny residential development and Kenny offset area.

Map of Throsby offset area

Download the map (PDF 778KB)

What’s so special about the Throsby and Kenny Broadacre offset areas?


The offset areas adjoin to Mulligans Flat Nature Reserve, and Goorooyarroo Nature Reserve, which has an additional  24 hectares managed by NSW National Parks and Wildlife Service across the border. Combined with other woodlands within the ACT and NSW, the offset areas are part of one of the largest, best connected and most diverse patches of box gum grassy woodland remaining in south-eastern Australia. They are also located in an area that is part of the Molonglo River to Barton Highway Woodland corridor, which has been nominated for provisional registration on the ACT Heritage List for its natural heritage values.

The source of Sullivan's Creek is within the Throsby East offset area. The creek flows from within the reserve through to the Kenny offset area and is a tributary of the Lake Burley Griffin and the Molonglo River.

Natural values significant under the Environment Protection and Biodiversity Conservation Act 1999 (Cwlth)

The Throsby North and Throsby East offset areas contain over half of the superb parrot nesting sites in the ACT. They also support approximately 166 hectares of golden sun moth habitat and about 163 hectares of box gum grassy woodland, which is important breeding habitat for threatened and declining woodland birds.

Kenny Broadacre supports a further nine hectares of box gum grassy woodland and approximately seven hectares of striped legless lizard habitat.

Threatened fauna includes

Threatened flora includes

Cultural values

The offset areas support cultural heritage sites including sites of aboriginal cultural and archaeological significance; remnant huts/homesteads, woolsheds, trees indicating old roads and an abandoned horse ploughed field. The Old Coach Road and Mulligans Flat Ploughlands are listed on the ACT Heritage Register. If artefacts are found they must not be disturbed to prevent a breach of the Heritage Act 2004. Read more about heritage.


The long term management aim is to conserve and improve the extent and understorey condition of box gum grassy woodland, the extent and condition of golden sun moth habitat, the extent and condition of striped legless lizard habitat; and to protect superb parrot breeding sites. Management will be in accordance with the offset management plan.

What can I do in this reserve?

Mulligans Flat and Goorooyarroo Nature Reserves are used for walking, running and cycling. Bird watching is also very popular. Ranger guided activities are organised within the Mulligans Flat Woodland Sanctuary.

Access for recreation may be reduced at times when stock is present within the offset areas.

Dogs and horses are not permitted within the reserves.

Get involved and volunteer with Friends of Mulligans Flat

Who do I contact with questions about this offset?

Phone Access Canberra on 13 22 81.