Brockman

Brockman National Park is a 1,885-hectare protected area in the karri forest region of the Warren bioregion, Western Australia, situated near Nannup. The park protects a significant expanse of karri (Eucalyptus diversicolor) forest — the magnificent tall forest endemic to the extreme southwest of Western Australia. The Brockman River, a tributary of the Blackwood system, flows through the park. The park is named after the pastoral pioneer Frederick Slade Brockman. It is managed by DBCA and forms part of the internationally recognised Southwest Australian Floristic Region.

Brockman's towering karri forest supports abundant wildlife. Western grey kangaroos, short-beaked echidnas, and brush wallabies are resident. Forest red-tailed black-cockatoos are emblematic karri forest inhabitants, feeding on karri seeds. The critically endangered western ringtail possum relies on karri, marri, and peppermint trees. Quendas forage in the forest floor leaf litter. Tiger snakes and dugites inhabit the forest floor and riparian zones. The Brockman River supports freshwater fish, including marron (the large native freshwater crayfish) in seasonally suitable reaches.

Karri stands reach 60–80 metres in Brockman, among the tallest hardwood forests on earth. The karri forest understorey includes karri oak (Allocasuarina decussata), native wisteria (Hardenbergia comptoniana), and various ferns in moist gullies. Riparian zones support swamp paperbark (Melaleuca rhaphiophylla) and sedges. The transition from karri to jarrah-marri on drier slopes creates diverse ecotone habitats. Spring wildflower displays include terrestrial orchids (Diuris, Pterostylis), running postman (Kennedia prostrata), and purple flags (Patersonia).

Brockman sits on the Leeuwin Block and transitional zone between the Leeuwin and Darling Plateau geological units. Granites, gneisses, and metamorphic rocks underlie the park. Deeply weathered laterite profiles cap elevated areas. The Brockman River valley has incised through weathered profiles to expose fresh basement rocks. Soils derived from these substrates support the distinctive karri forest on deep, moist profiles in valley positions.

Warm temperate to Mediterranean climate. Annual rainfall exceeds 1,000 mm, providing the moisture needed to sustain karri forest. Winters are cool and wet; summers warm and dry. The karri forest moderates local temperatures, creating a cooler, more humid microclimate than surrounding areas. Summer fire risk is significant despite the moist climate base.

The Brockman area forms part of Wardandi Noongar country. Noongar people have traditional connections to the karri forest country for thousands of years, using the forest for food (emu, kangaroo, fruit), timber, and cultural purposes. European settlers arrived in the late nineteenth century for farming and timber milling. Karri timber was highly prized for railway sleepers, heavy construction, and later flooring.

Brockman National Park was proclaimed to protect an outstanding karri forest area outside the main Warren and D'Entrecasteaux National Park blocks. The park complements adjacent State Forest karri reserves. The Brockman River provides important aquatic habitat. DBCA manages fire and invasive species in the park as part of the broader karri forest conservation framework.

The park offers bushwalking trails through towering karri forest, including access to the Brockman River. Spring wildflower walks are popular. Wildlife spotting at dawn and dusk provides excellent opportunities to see kangaroos, black-cockatoos, and potentially western ringtail possums. The Brockman River offers scenic forest creek environments.

Located near Nannup in the southern Blackwood region. Access via sealed and gravel roads. Minimal visitor facilities; the park is undeveloped. No camping. Visitors should carry water. The nearby town of Nannup provides accommodation and supplies.

The primary threats are Phytophthora cinnamomi dieback, which devastates proteaceous understorey; climate change reducing summer rainfall and soil moisture (already causing karri canopy dieback in some areas); and invasive weeds. The western ringtail possum's critical status demands protection of karri-marri food trees. Prescribed burning is carefully managed due to the moist nature of karri forest.