Leslie Harrison Dam upgrade

Leslie Harrison Dam supplies about 25% of Redland City's drinking water.

It is one of a number of dams in South East Queensland to be upgraded as part of Seqwater's Dam Improvement Program.

The $24m Leslie Harrison Dam upgrade will strengthen the dam wall and spillway to improve safety. The project is expected to be completed by mid-2019.

Here you can find everything there is to know about the project, along with construction updates and other important news. You can also contact a project team member to ask questions and find out more information.

Leslie Harrison Dam supplies about 25% of Redland City's drinking water.

It is one of a number of dams in South East Queensland to be upgraded as part of Seqwater's Dam Improvement Program.

The $24m Leslie Harrison Dam upgrade will strengthen the dam wall and spillway to improve safety. The project is expected to be completed by mid-2019.

Here you can find everything there is to know about the project, along with construction updates and other important news. You can also contact a project team member to ask questions and find out more information.

  • ALERT: Night works 14 - 28 August

    11 days ago
    05072018 vegetation clearing 3

    The upgrade works include replacement of the original raw water intake pipeline, which is now over 50 years old. The pipeline carries water from the dam to the water treatment plant. For safety reasons some sections of this pipeline can only be removed after normal work hours, when other activities are not occurring.

    From Tuesday 14 August for up to two weeks the contractor, Fulton Hogan, will be working in the evening until midnight. Work will start at the end of the dayshift and will continue until around midnight, until the pipeline work is complete.

    During this time, residents can...

    The upgrade works include replacement of the original raw water intake pipeline, which is now over 50 years old. The pipeline carries water from the dam to the water treatment plant. For safety reasons some sections of this pipeline can only be removed after normal work hours, when other activities are not occurring.

    From Tuesday 14 August for up to two weeks the contractor, Fulton Hogan, will be working in the evening until midnight. Work will start at the end of the dayshift and will continue until around midnight, until the pipeline work is complete.

    During this time, residents can expect:

    · Noise from construction works - to minimise impact on surrounding residents, noisy construction work will finish by 10pm each night. Other less noisy work will then continue until midnight.

    · Other minor disturbances associated with construction work, such as general noise and the use of generators and mobile lighting towers to light the work zones.

    · Light vehicles on local roads entering and exiting the work site.

    · All efforts will be made to keep noise and disturbance to a minimum. Silencing equipment and sound barriers will be used to limit noise from construction activity.

    Also, from today and continuing for a period of 3-4 months, dewatering pumps will be operating 24 hours a day, 7 days a week. These dewatering pumps are essential to reduce groundwater levels while excavations are completed downstream of the dam embankment. These dewatering pumps are fitted with an acoustic cover that reduces the operating noise, similar to that of an air conditioner, and are not expected to disturb local residents.

    Every effort will be made to limited noise impacts from night work. No interruption to water supply is expected as a result of this work. We appreciate the patience and understanding of residents.


  • Construction update

    23 days ago
    09072018 dump truck on site 1

    Construction of the temporary bridge over the spillway is underway. The bridge’s footings and headstocks have been completed. Components of the bridge itself are on site with the structure expected to take shape over the coming weeks. The temporary bridge is expected to be ready for construction traffic by late August.

    Major earthworks for a coffer dam on the old Tingalpa Creek line are well progressed. Piling is now underway for construction of a concrete wall at the toe of the dam wall to allow work on the weighted berm to commence.

    Noise, dust and vibration gauges have been installed...

    Construction of the temporary bridge over the spillway is underway. The bridge’s footings and headstocks have been completed. Components of the bridge itself are on site with the structure expected to take shape over the coming weeks. The temporary bridge is expected to be ready for construction traffic by late August.

    Major earthworks for a coffer dam on the old Tingalpa Creek line are well progressed. Piling is now underway for construction of a concrete wall at the toe of the dam wall to allow work on the weighted berm to commence.

    Noise, dust and vibration gauges have been installed between the work area and nearby residences. Retention basins have been constructed to capture and treat dirty water from site and prevent it entering waterways. Erosion and sediment controls are in place and protected vegetation areas have been fenced off.

    What to expect

    - Until construction of the temporary bridge over the spillway is completed, most construction traffic will continue to access the site via local streets including Larbonya Crescent and Willowie Crescent.

    - Minor disturbances associated with construction should be expected including noise from the use of heavy machinery. Every effort will be made to minimise impacts to residents.

    - Work hours are 7am to 5.30pm Monday to Friday and, when required, on Saturdays 7.30am to 2pm. Construction workers will be travelling to site on local roads for half an hour before and after work hours.


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  • Construction management plans now available

    23 days ago
    R0 5 2289 1526 w1200 h678 fmax

    During community consultation earlier this year, Seqwater made a commitment to share summaries of the contractor’s Environmental Management and Traffic Management plans. Both of these plans are now available in the document library on this website. These plans identify how Fulton Hogan has responded to community concerns including safety around Capalaba State College, impacts on nearby residents and impacts on the environment particularly to native wildlife.


    During community consultation earlier this year, Seqwater made a commitment to share summaries of the contractor’s Environmental Management and Traffic Management plans. Both of these plans are now available in the document library on this website. These plans identify how Fulton Hogan has responded to community concerns including safety around Capalaba State College, impacts on nearby residents and impacts on the environment particularly to native wildlife.


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  • Experienced contractors to start works on 25 June

    about 2 months ago
    Mabey bailey bridge

    Seqwater has appointed an experienced contractor, Fulton Hogan, to undertake construction. Work is expected to take up to 12 months to complete. The $24m Leslie Harrison Dam Upgrade will strengthen the dam wall and spillway to improve safety and is expected to be completed by mid-2019.

    What to expect during construction

    • Increased traffic, including delivery trucks, on local roads.
    • Most construction traffic will access the site via Dam Road, off Mount Gravatt – Capalaba Rd, and a temporary bridge across Tingalpa Creek from mid-July.
    • Temporary traffic management on local roads as required to maintain the...

    Seqwater has appointed an experienced contractor, Fulton Hogan, to undertake construction. Work is expected to take up to 12 months to complete. The $24m Leslie Harrison Dam Upgrade will strengthen the dam wall and spillway to improve safety and is expected to be completed by mid-2019.

    What to expect during construction

    • Increased traffic, including delivery trucks, on local roads.
    • Most construction traffic will access the site via Dam Road, off Mount Gravatt – Capalaba Rd, and a temporary bridge across Tingalpa Creek from mid-July.
    • Temporary traffic management on local roads as required to maintain the safety of both the community and construction workers.
    • Minor disturbances associated with construction work, such as noise and dust.
    • No change to existing Seqwater operations, including the Capalaba Water Treatment Plant.

    All works will take place between 7am and 5.30pm on weekdays and between 7.30am and 2pm on Saturdays. Construction workers will also be travelling on local roads for half an hour before and after work hours.

    Project contact details

    Fulton Hogan has established a community hotline and project email account for enquiries or complaints.

    Construction traffic access

    Dam Road will be the primary construction access route during the upgrade. This route is expected to be open from mid-July. Until then, all vehicles will use the existing access to the Capalaba Water Treatment Plant via Larbonya Crescent and Willowie Crescent.

    The crossing of Tingalpa Creek will use a temporary bridge structure, similar to those used by the military and for humanitarian and emergency access routes. This will reduce the environmental impacts associated with the creek crossing and the probability of inundation from spillway flows. The temporary bridge structure will be 55m long, about the length of four and a half city buses, and will safely transport 44 tonne trucks from Dam Road to the work site. The temporary bridge structure will be higher and more resilient than a typical creek crossing, but will still be unsafe to use during large flood events.

    Next steps

    Site establishment works will take four to six weeks. Heavy construction is expected to start in July.

    We will keep the community informed of progress with the project and any expected impacts.

    We appreciate your patience during these essential works.

  • Have your say in catchment management and dam upgrade planning

    23 days ago
    CLOSED: This discussion has concluded.



  • Construction planning

    about 2 months ago
    Srwpi112 traffic control stegemann road buccan

    During construction, we expect between 40 and 80 trucks per day to bring materials to and from the site. Seqwater recently sought community feedback on proposed construction access routes for heavy vehicles, including trucks, for the Leslie Harrison Dam upgrade Community feedback identified four significant areas of concern:

    • The impact on traffic on major roads and local streets.
    • The impact on residents living near construction access routes.
    • The impact on the environment, especially wildlife.
    • The impact on safety, particularly for pedestrians.

    A fifth recurring concern was recreation on and around Leslie Harrison Dam, however feedback...

    During construction, we expect between 40 and 80 trucks per day to bring materials to and from the site. Seqwater recently sought community feedback on proposed construction access routes for heavy vehicles, including trucks, for the Leslie Harrison Dam upgrade Community feedback identified four significant areas of concern:

    • The impact on traffic on major roads and local streets.
    • The impact on residents living near construction access routes.
    • The impact on the environment, especially wildlife.
    • The impact on safety, particularly for pedestrians.

    A fifth recurring concern was recreation on and around Leslie Harrison Dam, however feedback included comments both in favour of and opposed to the introduction of recreation.

    You can read the full report on community feedback here.

    The next step in the decision making process is to meet with local council officers to discuss the approval requirements, proposed traffic routes and community concerns. A decision on preferred traffic routes and traffic management will be made in conjunction with Brisbane City Council and Redland City Council.

    Additional investigations will be made to inform these decisions. This is likely to include engineering works, environmental surveys and geotechnical (soil) surveys, and may be completed on all proposed routes.

    We will provide regular updates to the community about progress with investigations, planning and decision making. Summaries of the environmental management and traffic management plans will be published on the project webpage and shared with residents near the access routes.

    The easiest way to stay informed of progress with planning and construction is to subscribe to email updates.

  • About the dam upgrade

    about 2 months ago
    Leslie harrison   spilling

    In 2014-15, the water level at Leslie Harrison Dam was lowered and the gates were removed to reduce the water load on the dam. Detailed investigations were conducted to identify a preferred solution to address the dam improvements required and meet Queensland Dam Safety Management guidelines.

    Following detailed investigations, the decision has been made to upgrade Leslie Harrison Dam and maintain its current full supply level once work is complete.

    The detailed design for the upgrade of Leslie Harrison Dam has now been completed. Construction is expected to begin in mid-2018 and will take around 12 months to complete, subject...

    In 2014-15, the water level at Leslie Harrison Dam was lowered and the gates were removed to reduce the water load on the dam. Detailed investigations were conducted to identify a preferred solution to address the dam improvements required and meet Queensland Dam Safety Management guidelines.

    Following detailed investigations, the decision has been made to upgrade Leslie Harrison Dam and maintain its current full supply level once work is complete.

    The detailed design for the upgrade of Leslie Harrison Dam has now been completed. Construction is expected to begin in mid-2018 and will take around 12 months to complete, subject to weather. Features of the upgrade design include:

    • widening and strengthening of the dam wall
    • anchoring the spillway at the crest and the lower end
    • improving resilience to extreme weather events and earthquakes
    • modifying the water intake tower to improve flood immunity.
    The gates will not be returned to the spillway.