Planning Marine Access for Bridge and Wharf Works: Seven Questions to Ask Before Hiring a Work Boat or Floating Platform

Bridge, wharf and waterfront projects often look straightforward from land. Once the workface sits above water, beneath a deck or between piles, access can become one of the project’s biggest constraints.

The wrong marine setup may restrict access, reduce productive hours around tides or require repeated mobilisation. The right solution can provide a stable work area and practical access where land-based equipment cannot reach.

Melbourne Boat Hire supplies work boats, punts, support vessels and modular floating platforms for inspections, maintenance and repairs. Before requesting a quote, answer these seven questions to help identify the right marine access package.

1. What work must be completed from the water?

Define the task before nominating a vessel or platform size.

A visual inspection has different requirements from concrete repair, painting, diving or operating powered equipment. The work method determines the platform position, required deck space and equipment capacity.

Provide a clear description covering:

The work activity and expected duration
Number of workers required at the workface
Tools, materials and plant to be carried
Required working height and reach
Whether the crew must access the soffit, headstocks, piles or riverbank
Any debris, waste or removed material that must be stored

Early clarity allows the marine-access supplier to assess whether a work boat, modular pontoon, barge or combined package is appropriate.

2. What are the site dimensions and physical constraints?

General arrangement drawings are useful, but planning needs more than overall dimensions. Critical information includes pile spacing, overhead clearance, water depth, riverbed conditions, shoreline access and obstructions. A platform that fits in plan may still be unsuitable beneath beams or at higher tides.

Marked-up drawings, photographs and a site inspection can help confirm:

Minimum horizontal and vertical clearances
Dimensions of the target work area
Launching and retrieval locations
Crane, trailer and vehicle access
Potential mooring or anchoring points
Exclusion zones and navigation channels
Overhead, underwater and shoreline hazards

Where a project moves progressively along a bridge or wharf, consider whether the access system can be repositioned efficiently as each section is completed.

3. How will tides and changing water levels affect productive hours?

On tidal waterways, the available clearance between a floating platform and the underside of a structure changes throughout the day. A platform may provide excellent access at low water but become unusable as the tide rises.

Establish the maximum workable water level and compare it with the tide cycle. At inland sites, also consider rainfall, dam levels, flows and operational water releases.

Useful questions include:

What is the workable water-level range?
How many productive hours are available each day?
Can the platform’s freeboard or configuration be adjusted?
Must equipment be removed before higher water?
Is a semi-permanent setup more efficient than daily mobilisation?

These answers influence platform height, mooring design, shift planning and the overall hire period.

4. What loads will the platform carry?

The number of people is only one part of the loading calculation. Tools, compressors, scaffolding, generators, materials, waste bins and mobile plant can quickly add significant weight.

Provide realistic maximum loads and show where they will be positioned. Concentrated loads may be more important than the platform’s total load, particularly when heavy equipment operates near an edge.

Depending on the proposed setup, a naval architect, engineer, or other competent person may need to assess stability, deck loading, freeboard and equipment placement. Do not add equipment such as elevated work platforms or scaffold systems after selecting the marine platform without reviewing the effect on stability and operation.

5. How will the platform be positioned and secured?

A floating work area must remain in the correct position while allowing for changing water levels and site conditions.

The method may involve anchors, mooring lines, spud poles, approved structural attachment or a combination. Selection depends on depth, riverbed conditions, currents, vessel wash, fixing points and required movements.

Positioning should also account for:

Safe access between shore, vessel and platform
Clearance from piles and sensitive assets
Emergency departure or recovery
Navigation requirements for other river users
Overnight security and monitoring
Repositioning between work stages

Mooring to a bridge, wharf or riverbank should never be assumed. Asset-owner approval and engineering input may be required.

6. What safety and waterway controls are required?

Marine access forms part of the project’s broader work health and safety system. The vessel and crew package must integrate with the principal contractor’s methodology, risk assessments and emergency arrangements.

Depending on the project, requirements may include:

Commercially qualified skippers and marine personnel
AMSA-surveyed vessels for the intended operation
Handrails and kickboards on floating platforms
Life-saving, firefighting and first-aid equipment
A dedicated safety or rescue boat
Floating exclusion buoys, lights, rope barriers or signage
Communications between shore, platform and vessels
Recovery arrangements for a person in the water
Spill-prevention and environmental controls

Melbourne Boat Hire’s commercial vessels can be supplied on a dry-hire or wet-hire basis, with qualified crew available where required. The final package should match the site, work method and responsible parties—not simply the lowest-cost boat available.

7. Which permits, notifications and approvals apply?

Waterway works may require approvals from the waterway manager, asset owner, council, port authority or other agencies. Requirements vary with location, duration, footprint and navigation impacts.

Possible documents and processes include a works permit, traffic-management arrangements, stakeholder notifications, Notice to Mariners, environmental controls and approvals for temporary mooring or occupation.

Confirm early who is responsible for each application and what information the marine supplier must provide. Permit lead times can affect mobilisation dates, and you should not assume approval until it has been issued.

Build the marine package around the project

Many projects require more than a single vessel. A practical solution may combine a modular floating work platform with a work boat for positioning, a smaller support vessel for personnel or equipment movements, and a dedicated safety boat during higher-risk activities.

Melbourne Boat Hire’s commercial fleet includes punts, work boats, support vessels, modular docks and floating platforms. We can develop configurations for bridge inspection and repair, wharf maintenance, water-based asset inspections, dive support, filming, environmental sampling, and temporary access.

Our experience includes providing custom modular access platforms for painting works on Melbourne’s Sandridge Bridge and a floating walkway at Kananook Creek to support critical water infrastructure works.

Request a properly scoped marine-access proposal

Involve a marine supplier while developing the methodology. Early input can identify access constraints, permit responsibilities and avoidable mobilisation costs before the program is locked in.

When enquiring, send available drawings, site photographs, proposed dates, work activities, crew numbers, equipment loads and any known waterway conditions. Melbourne Boat Hire can then review the project and recommend a suitable work boat, floating platform or combined marine-access package.

Contact Melbourne Boat Hire on 1300 988 309 or submit a commercial boat-hire enquiry to discuss safe, practical access for your bridge, wharf or waterfront project.