In 2012-13, we commissioned an independent review of our 26 referable dams, which found improvements are needed at a number of our dams to meet the Queensland Dam Safety Guidelines into the future.
Dam improvements are prioritised across the region in a staged program that is scoped and scheduled to maintain water supply security, while delivering best value for money.
Leslie Harrison Dam is one of a number of dams in South East Queensland to be upgraded within the next six years, as part of Seqwater's Dam Improvement Program.
Leslie Harrison Dam upgrade
In 2014-15, the water level at Leslie Harrison Dam was lowered and the gates were removed for the ongoing safety of the dam. Since then, detailed investigations were conducted to identify a preferred option to address the dam's safety issues and meet Queensland guidelines.
Following an assessment of all the dam safety options, the decision has been made to upgrade Leslie Harrison Dam in 2018-19 and maintain its current full supply level once work is complete.
We take public safety very seriously and while we appreciate the strong community interest in how we manage Leslie Harrison Dam, upgrading the dam is what we must do to keep it operating safely.
Construction is expected to start in mid-2018 and will take about 12 months to complete, subject to weather conditions and material availability.
A number of tools have been developed to help you learn more about Leslie Harrison Dam, it's history, how the dam operates and plans for the future. We have also created an animation to help explain a gated and ungated Leslie Harrison Dam works during heavy rainfall events.
Leslie Harrison Dam Social Pinpoint Map
To view this map full screen, click here:
Detailed design and traffic management
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
- improving resilience to extreme weather events and earthquakes
- the gates will not be returned to the spillway.
Tender documents will be released in January 2018 to start the process of appointing a contractor to build the upgrade. Interested parties should register at https://www.hpw.qld.gov.au/qtenders/. Some details, including traffic management plans (see below), will be confirmed with the appointed contractor after the tender process.
Seqwater is seeking community feedback on proposed construction access routes for heavy vehicles, including trucks, for the Leslie Harrison Dam upgrade. Feedback must be received by 5 February 2018.
During construction, we expect between 40 and 80 truck movements per day to bring materials to and from the site. The existing local road network is not a suitable option for heavy vehicles. Local streets such as Willowie Cres and Larbonya Cres are narrow, have on street parking and sharp bends which would make it difficult for heavy vehicles to access the site safely. However, the local road network may be used by light vehicles, such as work utes, to access the construction site.
Four access routes have been identified as suitable, each with advantages and disadvantages. These are summarised below. To manage the impacts, Seqwater could consider limiting delivery times, splitting heavy vehicles between access routes or implementing control measures.
||Access from Mt Gravatt Capalaba Rd via the existing access track to a laydown yard. A temporary crossing over Tingalpa Creek below the dam spillway for transfer of materials by smaller vehicles.
||Avoids most impacts on neighbouring residents. Uses existing access easement.
||Traffic impacts on Mt Gravatt Capalaba Rd. Creek crossing subject to flooding and tidal surges. Heavy trucks will not be able to use creek crossing. Longer time to deliver materials due to transfer. Requires widening and resurfacing of access track.
||Access from Mount cotton Rd via Killarney Cres and the Killarney Crescent Park onto Seqwater land.
||Shortest access option. Uses existing streets and Seqwater land. More flood resilient than Dam Rd.
||Noise impacts on neighbouring residents. Traffic impacts on Killarney Cres. Impact on Killarney Crescent Park. Requires widening and resurfacing on fire break.
|Willowie Cres (for small vehicles only)
||Entry via Howlett Rd, down Beenwerrin Cres and Willowie Cres. Exit via Larbonya Cres.
||Use existing streets.
Not suitable for heavy vehicles or trucks. Could only be used by contractor vehicles (such as utes).
||Access from Mount Cotton Rd via Howlett Rd, then along the edge of the dam.
||Uses existing streets and Seqwater land only.
||Noise impacts on neighbouring residents. Requires widening of western end of Howlett Rd. Requires construction of new access track. Environmental disturbance to catchment area along the edge of the dam. Longest access option.
Find out more and provide your feedback
You can find more information and leave your feedback on the Social Pinpoint map. Alternatively, send your feedback to email@example.com .
Feedback on construction access routes must be received by 5 February 2018.
Community information and dam tours
Speak to the project team at the Redlands Indigiscapes Centre, 17 Runnymede Road in Capalaba on:
- Thursday 25 Januay 2018 from 5.30pm to 8.30pm
- Monday 29 January 2018 from 9am to 12pm
The local community is invited to attend a tour of Leslie Harrison Dam and Capalaba Water Treatment Plant to learn more about how we operate and manage this essential infrastructure, and what will happen during the upgrade. This is a rare opportunity to see the dam wall and the treatment plant.
Please note the following:
- This event is not suitable for children under 10 years due to safety risks.
- We can provide some support for people with mobility issues, but they will not be able to access all areas on the tour.
- All attendees must register and provide their full name and home address to meet the security requirements of the site.
- All attendees must wear fully enclosed shoes, long pants and a hat. We strongly recommend long sleeves, insect repellant and sunscreen.
Numbers for each tour will be limited for safety reasons. Please email firstname.lastname@example.org to be added to a waiting list if tours are filled. Additional tours may be added if there is significant demand.
One tour has been reserved for residents who may be affected by proposed construction traffic routes, and will include additional time to discuss proposed routes and possible mitigation measures.
|Friday 19 January
||2pm - 4pm
||Register here [links to external site]
|Saturday 20 January
||9am - 11am
||Register here [links to external site]
|Saturday 20 January
||2pm - 4:30pm
||Reserved tour for residents potentially affected by proposed traffic routes.
To register, email email@example.com
Find out more
Frequently asked questions