Logan River Estuary, South Eastern Queensland
The Logan River (Yugambeh: Dugulumba) is a major river system located in the Scenic Rim, Logan and Gold Coast local government areas of South Eastern Queensland, Australia.
Logan River MangroveWatch was a WPSQ Logan Branch project conducted with funding support from Logan City Council EnviroGrants, Wildlife Queensland Coastal Citizen Science and with in-kind support from Jacobs Well Environmental Education Centre and Kimberley College.
Group Support Base
Goals & Achievements
i. 1237 ha of tidal wetlands in Logan R – 70% mangrove.
ii. Mangroves occupy 85% of shoreline downstream of Bethania Railway Bridge (slightly higher than Moreton Bay average).
iii. Shoreline mangrove density and biomass is greatest within the mid-estuary between the highway bridge and Carbrook. Overall shoreline mangroves in the Logan R are less dense than the Moreton Bay average.
iv. More than 50% of mangroves in the mid and lower estuary are classified as high value.
v. 28% of tidal wetlands lost in Logan River estuary since settlement. Mostly saltmarsh (66% loss) and Casuarina (54% loss).
vi. Shoreline mangroves are overall in Poor condition and scored below the Moreton Bay average (2.6/4 compared to 3.3/4). The mangroves in worst condition are present in the upper estuary between Bethania and Beenleigh. With mostly healthy mangroves in the mid-estuary. Recent severe weather events, including flooding, have impacted mangroves in the Logan River.
vii. Extensive shoreline erosion was observed along the estuary margins. The upper estuary and the lower estuary are experiencing shoreline erosion in excess of normally expected values, with net shoreline loss occurring. Shoreline erosion in the form of estuary bank slumping is likely contributing large amounts of sediment to Moreton Bay. Very little mangrove shoreward expansion is occurring within the estuary.
viii. More than 50% of high value mangroves are at risk of loss due to human impacts, poor condition and/or shoreline erosion in the upper estuary and the lower estuary. High-value mangroves immediately downstream of the Albert River at the least risk of loss. 4. Issues threatening mangrove recovery
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