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Dam Works Permit

Under the Water Management Act 1999, this project requires a dam works permit. Following assessment by NRE Tasmania’s Water Management and Assessment Branch, a permit was granted on 29 May 2023. A request to review this decision has been lodged. More information about the Dam Works Assessment Decision Framework can be found here. An update on the status of this review is expected in August.

Project Schedule and timings

Quarry Choice

We recently confirmed that the bulk of hard dolerite materials needed to build the new rock buttresses can be sourced from Halls Quarry, just outside of Maydena. Selecting this nearby quarry is a great outcome as it significantly reduces truck traffic through community centres and reduces the project’s overall carbon footprint. We’ll need to continue to bring a smaller amount of specialised materials from Boral Quarry in Bridgewater.

We’re nearly ready to remove the first section of concrete facing! Stockpiling of materials has commenced in readiness for constructing the first section of filter buttress and the team completed a successful trial placement of sand, gravel and rock layers against a practice embankment. This was a key step in further developing the construction methodology.

The complex, deep excavation work is largely done, and the new buttress can be seen rising in a staggered fashion along the length of the dam wall.  The precast concrete wave wall panels have started to be moved into their permanent position. This will allow further placement of material around the panels and construction of a new concrete slab on the dam crest. Deliveries of buttress materials (sand, gravel and rock) are expected to be completed in May which will see a reduction in truck movements on Gordon River Road.