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.

  • Construction Update

    about 2 months ago
    20180924 conduit and coffer dam

    The upgrade of Leslie Harrison Dam is continuing on schedule and the project is progressing well across the entire site.

    Construction update

    Both the areas below the dam wall and on the spillway are now in full construction mode. Work includes:

    • Spillway anchoring work is well underway. Steel dowel rods will pin the bottom of the spillway into the bedrock below, and large post-tensioned steel anchors will be installed at the crest of the spillway. Anchoring the spillway to the bedrock will make it more resillient to the forces of extreme floods

    The upgrade of Leslie Harrison Dam is continuing on schedule and the project is progressing well across the entire site.

    Construction update

    Both the areas below the dam wall and on the spillway are now in full construction mode. Work includes:

    • Spillway anchoring work is well underway. Steel dowel rods will pin the bottom of the spillway into the bedrock below, and large post-tensioned steel anchors will be installed at the crest of the spillway. Anchoring the spillway to the bedrock will make it more resillient to the forces of extreme floods
    • Finishing touches are being put on a new coffer dam on the old Tingalpa Creek. This coffer dam will be a permanent addition to the Leslie Harrison Dam site
    • Work is continuing on the replacement of the raw water pipeline connecting Leslie Harrison Dam to the Capalaba Water Treatment Plant. The concrete conduit that carries the pipeline under the dam wall is being extended and a new access shaft is being built
    • Underground electrical conduits are being installed which will replace the existing overhead electrical wires. This will improve safety at Leslie Harrison Dam, both during and after construction
    • Excavation to remove sandy (alluvial) soils, widen the dam embankment and build a weighted berm below the dam wall is well underway. Work has started on building the widened embankment.

    Temporary bridge over Tingalpa Creek

    Heavy vehicles transporting materials to and from the project site are now using the temporary bridge over the dam spillway. The benefits of this bridge will be particularly important over the coming months, as large volumes of rockfill are delivered to site.

    The bridge was installed to keep trucks off more populated local roads. Light vehicles (like cars and utes) still use Larbonya Crescent and Willowie Crescent to access site. Local streets will only be used as a heavy vehicle backup contingency route in the event of major disruption on Mount Gravatt-Capalaba Road or maintenance on the bridge.

    Planning for wet season

    With major works now underway on the spillway, we need to consider the potential for heavy rain to fill the dam and for water to flow over the spillway. It’s expected the bulk of work on the spillway will be completed before the wet season is upon us, but we are closely monitoring weather conditions including long-range weather forecasts. Should a major weather event occur, the spillway can be cleared of equipment and activity within a day.

    What to expect

    Thank you for your patience during construction of the temporary bridge and during recent night works to remove some of the old intake pipes. Your understanding is greatly appreciated by the whole project team.

    As construction continues you can expect minor disturbances associated with construction. This includes noise from the use of heavy machinery including the piling rig on the spillway. Every effort will be made to minimise impacts to local residents however, some noise is unavoidable.

    Work hours are 7am to 5.30pm Monday to Friday and 7.30am to 2pm on Saturdays, when required.


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  • Dam Road site access now open

    about 2 months ago
    09072018 dump truck on site 1

    The temporary bridge over the spillway is now complete and is being used by trucks and other heavy vehicles to access the work site. Trucks are entering the site from Dam Road off Mount Gravatt-Capalaba Road.

    Want to se how we built the temporary bridge? Check out this video!

    There are changed traffic conditions on Mount Gravatt-Capalaba Road near the interchange with Moreton Bay Road. Trucks will be accessing Dam Road between 7am and 5pm. Please drive with caution and observe all signage in place. Dam Road is only accessible to construction vehicles.

    The completion of the bridge means...

    The temporary bridge over the spillway is now complete and is being used by trucks and other heavy vehicles to access the work site. Trucks are entering the site from Dam Road off Mount Gravatt-Capalaba Road.

    Want to se how we built the temporary bridge? Check out this video!

    There are changed traffic conditions on Mount Gravatt-Capalaba Road near the interchange with Moreton Bay Road. Trucks will be accessing Dam Road between 7am and 5pm. Please drive with caution and observe all signage in place. Dam Road is only accessible to construction vehicles.

    The completion of the bridge means that only light vehicles (personal cars and utes) will be regularly using Larbonya Crescent and Willowie Crescent. These local roads will remain a backup contingency route for other vehicles to access site if required, such as during maintenance on the temporary bridge.


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  • About the dam upgrade

    4 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.
  • Construction management plans now available

    3 months 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

    4 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.

  • Construction planning

    4 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.

  • Have your say in catchment management and dam upgrade planning

    21 days ago
    CLOSED: This discussion has concluded.