Macdonald River Subcatchment
More than half of the subcatchment is in Yengo National Park forming part of the Greater Blue Mountains World Heritage Area.
The majority of river reaches in this subcatchment are in near intact condition. The headwaters of some of the major creeks flow through National Park and the lower section of the subcatchment has been developed for agriculture. The Macdonald River has undergone river metamorphosis as a result of a series of floods in the late 1940s and early 1950s. Catastrophic channel change resulted in the channel greatly widening through bank erosion and filling up with sand. The lack of riverbank vegetation was a major contributor to the channel change. Much of the main river channel is choked with the highly invasive black willow and this stand of willow is thought to be a source of seed to other subcatchments of the Hawkesbury Nepean. The channel of the main river now appears to be recovering from the initial erosion and presents a good opportunity for revegetation to stabilise the bank sediments. There is significant local community commitment to managing the threats along the lower reaches of the Macdonald River |
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