- NATURAL RESOURCE MANAGEMENT STRATEGY FOR THE NORTHERN AGRICULTURAL REGION OF WESTERN AUSTRALIA
The Shire of Irwin has an extensive Indian Ocean coastline centred on the coastal communities of Dongara and Port Denison. The coast includes sandy beaches, dune systems, rocky and limestone reefs, the Irwin River mouth and nearshore marine habitats that support important ecological, recreational, cultural and economic values. The coastal and marine environment is important for fishing, boating, swimming, surfing and tourism. Port Denison Marina provides boating and fishing infrastructure, while beaches including South Beach, Grannys Beach, Surf Beach and Seaspray Beach are important recreational areas for residents and visitors. Coastal erosion and inundation are important long-term management issues. The Shire’s Coastal Hazard Risk Management and Adaptation Plan and Coastal Management Plan provide a framework for managing coastal hazards, development and recreational use of the coastline. Grannys Beach at Port Denison is recognised by the Western Australian Government as a coastal erosion hotspot, where shoreline change has been influenced by the Port Denison Marina and associated changes to sediment movement.
The Shire of Irwin has an extensive Indian Ocean coastline centred on the coastal communities of Dongara and Port Denison. The coast includes sandy beaches, dune systems, rocky and limestone reefs, the Irwin River mouth and nearshore marine habitats that support important ecological, recreational, cultural and economic values. The coastal and marine environment is important for fishing, boating, swimming, surfing and tourism. Port Denison Marina provides boating and fishing infrastructure, while beaches including South Beach, Grannys Beach, Surf Beach and Seaspray Beach are important recreational areas for residents and visitors. Coastal erosion and inundation are important long-term management issues. The Shire’s Coastal Hazard Risk Management and Adaptation Plan and Coastal Management Plan provide a framework for managing coastal hazards, development and recreational use of the coastline. Grannys Beach at Port Denison is recognised by the Western Australian Government as a coastal erosion hotspot, where shoreline change has been influenced by the Port Denison Marina and associated changes to sediment movement.
The Shire of Irwin has a diverse economy based on agriculture, fishing, mining and resources, tourism, construction and local services. Dongara and Port Denison provide the main commercial and service centre for the Shire and support industries operating across the surrounding rural and coastal areas.
Agriculture remains an important land use and economic activity, with broadacre cropping and livestock production across much of the rural landscape. Commercial fishing also has a long history in the Shire, with Port Denison providing marine infrastructure that supports fishing and boating activities.
Mining and resource industries have become increasingly important to the local and regional economy. The Shire is also planning for investment associated with emerging energy and resource industries, particularly within the Arrowsmith Resources Area.
Tourism contributes to the local economy through the coastal setting, beaches, fishing and boating, the Irwin River estuary, heritage attractions and the communities of Dongara and Port Denison.
The Shire of Irwin lies within the northern Perth Basin and is predominantly underlain by sedimentary rocks. These include Mesozoic sedimentary units such as the Yarragadee Formation and Kockatea Shale, together with younger sediments associated with the coastal plain, river valleys and dune systems. The Kockatea Shale occurs in parts of the northern Shire and consists mainly of shale with minor siltstone and sandstone.
Landforms and soils vary considerably across the Shire. Coastal areas include dunes, sand sheets, low limestone hills and alluvial plains, with shallow and deep calcareous and siliceous sands and some loamy and sandy earths. Further inland, dissected lateritic terrain, sandplains and gently undulating landscapes support pale and yellow deep sands, sandy gravels, duplex soils and loamy earths. The Irwin River valley includes alluvial flats and terraces with red sandy earths, duplex soils, cracking clays and red loamy earths.
The Shire lies within the Geraldton Hills (GES01) and Lesueur Sandplains (GES02) subregions of the Geraldton Sandplains IBRA bioregion. Native vegetation includes species-rich proteaceous heath and scrub-heath on sandy soils, together with Acacia shrublands and York gum and other woodland communities on alluvial and inland landscapes.
The Clay flats assemblages of the Irwin River as originally described in Beard (1976)* were formerly listed in Western Australia as presumed totally destroyed. In 2025, the community was formally listed under the Biodiversity Conservation Act 2016 as a Collapsed ecological community. It historically comprised sedgelands and grasslands with patches of York gum (Eucalyptus loxophleba) and scattered river gum (Eucalyptus camaldulensis) over Acacia acuminata and Acacia rostellifera shrubland on the clay flats of the Irwin River.
The Shire also contains the Priority 1 ecological community Coastal sands dominated by Acacia rostellifera, Eucalyptus oraria and Eucalyptus obtusiflora. This coastal mallee community occurs on limestone ridges and dune swales along parts of the coast between the Geraldton area and Dongara.
*Beard, J.S. (1976). The Vegetation of the Dongara Area, Western Australia. Map and Explanatory Memoir, 1:250,000 Series. Vegmap Publications, Applecross, Western Australia.
Agriculture is the dominant productive land use across much of the Shire of Irwin, with broadacre cropping and livestock production occupying extensive areas of the rural landscape.
Urban, commercial, industrial and tourism-related land uses are concentrated primarily around Dongara and Port Denison. Mining, resource and energy development, transport infrastructure and utilities are also increasingly important components of the Shire’s land-use pattern.
The Shire contains significant areas of remnant native vegetation and a network of conservation reserves. Important protected areas include Yardanogo Nature Reserve, Dongara Nature Reserve, Beharra Springs Nature Reserve and part of Beekeepers Nature Reserve. These reserves protect native vegetation and habitat within a landscape that has been extensively modified by agriculture and other development.
Remaining native vegetation, river corridors, coastal environments and ecological linkages are important for maintaining biodiversity and landscape connectivity across the Shire.
The Shire of Irwin’s population is concentrated primarily in the neighbouring coastal communities of Dongara and Port Denison, with residents also living on rural properties and in smaller settlements throughout the Shire. Dongara–Port Denison functions as the main commercial, administrative and service centre.
At the 2021 Census, the Shire of Irwin had 3,680 residents. The median age was 53 years, and 146 people — 4.0% of the population — identified as Aboriginal and/or Torres Strait Islander.
The Shire has an older population profile than Western Australia overall. Its coastal setting and regional lifestyle contribute to its appeal as a place to live and retire, while future population and housing demand may also be influenced by growth in the resources and energy sectors.
The Irwin River is the principal river system within the Shire of Irwin. It flows westwards through the agricultural landscape and Dongara before reaching the Indian Ocean. The lower river and estuary provide important riparian, wetland and estuarine habitat as well as recreational and landscape values for the local community. Groundwater is an important resource for public water supply, agriculture, industry and the environment. Much of the Shire is associated with the Arrowsmith Groundwater Area of the Northern Perth Basin, which includes the Dongara groundwater-management subarea and a number of shallow and deeper aquifer systems. The Allanooka–Dongara Water Reserve forms part of the regional drinking-water supply system and supplies Dongara and Port Denison as well as other communities in the Mid West. Protecting groundwater quality and recharge areas is therefore an important consideration in land-use planning. Water resources are influenced by the region’s variable rainfall, groundwater abstraction, land use and a drying climate. Sustainable management of groundwater and protection of the Irwin River, estuary and other water-dependent environments are important for both human use and ecosystem health.
