Waterway restoration - Oaks Estate (upper Molonglo catchment)

15/11/2018 - Letters advising of the start of works are being delivered to residents who live within a 100m radius of the site. Please check your letterbox. You can also view the letter here.


Waterway restoration upstream of the confluence of the Queanbeyan and Molonglo Rivers, Oaks estate

The upper Molonglo catchment (which includes the Molonglo and Queanbeyan rivers) represents 37% of the lake Burley griffin catchment.

Reaches of both rivers will be rehabilitated to help improve the quality of water in the catchment, in surrounding areas and in Lake Burley Griffin.

The works include rock chutes, stock exclusion fencing, weed removal, pest control and revegetation downstream of the Molonglo Gorge Nature Reserve to Oaks End Road, and in the Queanbeyan River from the ACT border to the confluence with the Molonglo River.

The works will reduce the amount of erosion on the banks while also improving the site’s aesthetics. An increase in biodiversity and a reduction in weeds should encourage native plants, birds, aquatic species and other animals.

The creation of a riparian buffer (a vegetated area which helps shade and partially protect the stream from the impact of adjacent land uses) of approximately 10 metres will have a major stabilising influence on stream systems, reducing the rates of channel change and helping to maintain the natural ecological balance.

The revegetation areas total approximately 61,600 square metres. When all works are complete, it’s estimate that over 46,000 kilograms of suspended sediment, nitrogen and phosphorous will be prevented from entering the water.

Start date

December 2018

Likely construction finish date

May 2019+

Anticipated establishment period

Two years from the finish of construction^

+Works may be delayed by a number of factors, including bad weather. Planting is part of the construction phase and the timing of the growing season may impact on construction timelines.

^Water plants in particular may take up to two years to become established. The length of time may vary depending on ground and weather conditions.

*Some areas of the site may remain closed to the public past this point to allow for additional planting or for plants to become established.

More information

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How this project might impact you

  • Trucks will pass in and out of the area during the improvement work. Routes have been established to minimise traffic disruption and noise and to avoid Grassy Woodland areas
  • Any detours for walkers and cyclists will be in place and will be clearly signposted
  • The site will be fenced for public safety
  • The contractor has prepared a Construction Environment Management Plan (CEMP) to detail how it will deal with flora and fauna issues.