The Maribyrnong Defence Site: Its History and What Is Proposed for Its Future

The former Maribyrnong Defence Site is proposed to become a new riverside neighbourhood, but major contamination, planning and transport issues must be resolved before that can happen. The large Commonwealth-owned property in Maribyrnong, Victoria was used to make and test explosives, ammunition and military materials for much of the twentieth century. Its proposed Redevelopment could bring housing, public open space and access to a long-closed part of the Maribyrnong River. Yet the site's industrial past remains in its soil, buildings and groundwater.

This makes the land very different from a cleared housing estate. Any plan must deal with pollution before homes, schools or public parks can safely open. It must also protect heritage structures and repair natural areas along the river. The main idea is simple: the site's future depends on whether its damage can be cleaned up while its useful history and river setting are kept.

Why was this riverside land used for defence work?

The site's defence story began in the early 1900s, when Australia wanted a local supply of military ammunition and explosives. The land sat outside the dense centre of Melbourne at the time. It covered a broad area beside the Maribyrnong River and had enough space to separate risky production tasks.

The river valley also offered access to water, nearby rail connections and routes to factories and ports. Those practical features made the area useful for large industrial plants. Defence production grew alongside other heavy industry in Melbourne's west.

The complex became known through names such as the Explosives Factory Maribyrnong. It contained production buildings, laboratories, workshops, storage areas and internal roads. Earthen banks and wide gaps separated some structures. These features were designed to limit damage if explosive material caught fire or went off.

This article focuses on the defence site's own history and proposed future. The wider industrial growth of Maribyrnong and the story of nearby Jack's Magazine form separate parts of the area's past.

What happened at the site during wartime?

Production rose during both world wars as demand for ammunition increased. Workers handled dangerous materials under strict controls. Many tasks involved mixing chemicals, filling ammunition or checking finished products. Women formed a large part of the workforce during wartime, especially when many men were serving overseas.

The factory affected daily life beyond its fences. It provided jobs and helped shape transport, housing and services in the surrounding district. Its workforce also carried a personal cost. People worked near explosive and toxic substances at a time when safety rules and knowledge were weaker than they are now.

After the Second World War, defence research and production continued as military needs changed. Buildings were altered, new work areas appeared and some older processes ended. This long use matters because pollution did not come from one spill in one place. Different chemicals were stored or used across the property over many years.

Why did defence use end?

Australian defence manufacturing changed late in the twentieth century. Some production moved, some facilities became outdated and the need for such a large enclosed complex fell. Operations at Maribyrnong were reduced, leaving buildings and service networks that no longer matched modern defence needs.

The Commonwealth eventually identified the land as surplus to defence requirements. That created an unusual opportunity. A large site relatively close to central Melbourne could return to wider public use. It also created a costly duty to investigate what decades of industrial work had left behind.

Vacant land can look ready for building from outside the fence. This property is not an empty field. Old drains, buried services, former process areas and demolished structures may all affect how contaminants move. Records help investigators locate risks, but testing must confirm what is actually present.

What makes the site difficult to clean up?

Contamination is the main barrier between the former factory and a future neighbourhood. Explosives manufacture can leave chemical residues in soil. Fuel, solvents, metals, asbestos and waste from workshops may add further risks. Each pollutant behaves differently and may need its own treatment.

Groundwater pollution is a special concern because water below the surface can carry dissolved chemicals beyond their original source. Investigators need to map the direction and speed of that movement. They must also check whether polluted groundwater could reach the Maribyrnong River or affect land outside the property.

A proper investigation divides the site into smaller areas based on their past use. Samples then show which places need action and which may already be suitable for a planned use. The required standard depends on what will happen there. A fenced service area does not have the same exposure risk as a garden where children may play.

Environmental remediation may include removing polluted soil, treating it on site, sealing it beneath approved structures or stopping contaminants from moving through groundwater. Monitoring often continues after physical work ends. A clean-looking surface does not prove that deeper soil or water is safe.

The sequence matters. Planners cannot sensibly lock in every street, park and home before they understand the pollution below them. Cleanup findings may rule out sensitive uses in certain areas or make some building types too costly.

What is proposed for the land?

The broad proposal is a Mixed-use development with new housing, community facilities, open space and areas for local activity. Plans discussed over time have aimed to turn the closed defence property into a connected part of Maribyrnong rather than a private estate cut off from its surroundings.

Housing is a major part of the case for change. Melbourne needs more homes in established urban areas, especially where people can reach jobs and services without long drives from the outer fringe. The defence land is large enough to support a full neighbourhood if cleanup and access can be delivered.

The word proposed is important. Concepts, planning documents and government announcements do not mean every building has final approval. The number and type of homes may change as remediation costs, heritage controls and Infrastructure needs become clearer.

A workable plan would need to set out:

where homes and community uses can safely stand;
which heritage buildings and industrial features will remain;
how roads, walking routes and public transport will connect to nearby areas;
which riverfront land will become public open space;
how cleanup and long-term monitoring will be funded;
how development stages will avoid exposing workers and neighbours to pollution.

These are linked choices. A proposed park may look generous on a map, but it has little value if people cannot reach it or if cleanup limits how it can be used.

How could the riverfront change?

The Maribyrnong River gives the site much of its public value. Defence controls kept long sections of the bank away from everyday public access. Redevelopment could open new walking and cycling links, connect existing paths and create places where people can spend time beside the water.

Opening the bank also carries duties. The river corridor supports plants, animals and movement between habitat areas. Biodiversity work should repair damaged ground, protect useful vegetation and reduce polluted runoff. River access must be designed around flood behaviour and bank stability rather than treating the water as a view behind new apartments.

More paths can help people enjoy the river, yet careless lighting, hard surfaces and heavy visitor use can disturb habitat. The best outcome gives people access while leaving quieter areas for wildlife. Native planting and wide river setbacks can support that aim.

Climate risk must also shape the design. Some low land near a river can flood, and future rainfall patterns may change the size or frequency of those events. Sensitive buildings should not be placed where floodwater is expected to move or collect. Open space can sometimes hold water more safely, provided contaminated soil cannot be washed into the river.

Why will transport shape the final plan?

A large housing project creates thousands of daily trips. Existing local roads already carry traffic through constrained river crossings and established neighbourhoods. Adding homes without strong transport planning would push more cars onto those routes.

New Infrastructure must therefore be planned with the first stages of development. Safe walking links, frequent buses and connected cycling routes can reduce short car trips. Road changes may still be needed for service vehicles and access, but road capacity alone cannot solve the travel demand created by a new neighbourhood.

The internal street plan matters too. Large former industrial blocks can produce long walking distances if developers keep the old barriers. Smaller connected blocks make it easier to walk to a bus stop, park or local shop. They also give emergency services more than one route through the site.

Transport promises should come with timing and funding. A service that might arrive after most homes are occupied will not shape early travel habits. Residents will buy cars and build routines around them if useful alternatives are missing at move-in.

What should happen to the old factory structures?

The site contains buildings and industrial features that help explain how Australian defence production worked. Keeping every structure may be unsafe or impractical. Removing everything would erase the physical evidence that makes the place distinct.

A heritage assessment should identify structures with the strongest historic meaning, then match them with uses that can support their care. A sound former workshop might become a community or commercial space. Smaller industrial features could remain within parks with clear signs that explain their role.

Reuse depends on contamination and building condition. Hazardous materials may sit within walls, roofs, floors or old equipment. A structure worth keeping still needs a safe plan for repair and access.

The strongest heritage approach treats the whole layout as evidence. Blast banks, building gaps and old movement routes can explain the site even where individual buildings are gone. New streets and open spaces can retain parts of that pattern instead of placing a generic estate over it.

Who is responsible for making the change safe?

The Commonwealth owns the former defence land and carries responsibility for managing it under federal requirements while it remains in Commonwealth control. The Victorian planning system, environmental rules and local government responsibilities also affect what can eventually be built and used.

That split can confuse residents because no single public body controls every decision. The landowner may lead investigation and remediation. State agencies may guide planning, environmental protection, roads or public transport. The local council may later manage local streets, parks and community assets.

Clear public records are vital. People need access to contamination findings, cleanup goals, audit results and any limits placed on future land use. Technical reports should show where samples were taken and what standards were applied. A broad statement that land will be remediated does not explain whether it will be safe for homes, gardens or contact with groundwater.

What could delay the project?

The biggest source of delay is uncertainty beneath the ground. Early testing can find pollution that requires more investigation. Cleanup methods may then need trials, approvals and years of monitoring. Costs can rise if contaminated material must be moved to a licensed facility.

Planning can also slow when transport upgrades, heritage protection and development density remain unresolved. These are not side issues. They decide how many people the site can support and whether the finished area will work.

Market conditions may affect when homes are built, but public safety standards should not change with the property cycle. Cleanup must meet the approved future use even when that reduces the amount of land available for sale.

Staged development is likely because the property is large and complex. One cleaned section may open while investigation continues elsewhere. Each stage needs safe boundaries so dust, trucks or groundwater work do not create new risks for early residents.

What would a good result look like?

A good result would open a closed part of Maribyrnong, Victoria while dealing honestly with its industrial damage. It would provide useful housing, public river access and services that arrive when residents need them. It would retain enough of the factory setting to make the history clear.

Success should be measured through results people can check: land certified for its stated use, pollution kept away from the river, public paths that connect at both ends and transport available from the first occupied stage. Ongoing groundwater data should remain public where monitoring is required.

The site should also feel connected to the surrounding suburb. Public streets must meet existing routes where practical. Parks should serve current neighbours as well as new residents. River paths should form part of a wider network instead of ending at a development boundary.

Before judging any new proposal, check whether it gives firm cleanup standards, funded transport and guaranteed public river access, because those details will decide whether the Maribyrnong Defence Site becomes a safe neighbourhood or stays an attractive plan on paper.