CONSTRUCTION WORKS & OTHER ISSUES
The New South Wales Government (through Sunraysia
Regional Algal Coordinating Committee) has issued a
red alert warning for toxic blue-green algae in the
Great Darling Anabranch at Tara Downs. The water at
that site is unsuitable for domestic, irrigation and
Although this toxic blue-green algal bloom poses no
immediate threat to South Australia at this stage, the
Murray-Darling Basin Authority and the relevant South
Australian Government agencies are regularly
monitoring the situation.
is not uncommon to experience algal blooms at this
time of the year.
Lowering of Mildura Weir
pool in 2014
Plans are underway for the
Mildura Weir pool to be fully drawn down for about
three weeks during May and June to allow new trestles
with mechanised gates to be installed. The work will mean that
Lock 11 will be closed during this period and boat
access through the weir will not be possible.
The Murray–Darling Basin
Authority and Goulburn–Murray Water anticipate the
work will start in May but are already consulting with
local river users, including tourism operators, to
determine the most appropriate time to carry out the
MDBA head of River
Management David Dreverman said the drawdown would
take the water level in the Mildura Weir pool to about
3.6 metres below full supply level, depending on river
It is also expected the
weir will need to be drawn down again for a prolonged
period in winter 2015 for works that include repairing
the concrete apron, which sits on the riverbed and
supports the trestles.
The MDBA and Goulburn–Murray
Water will issue further advice with more specific
dates and details in the coming months.
Sandbars in the vicinity of the Murray Mouth may cause
navigation hazards. Mariners are advised to navigate
with caution when operating in the area.
Sandbars are also present along sections of the River
Murray in South
Australia and all watercraft users should be aware of,
and regularly check, the river depth.
Subject to confirmation by the Commonwealth
Government under the Environment Protection and
Biodiversity Conservation Act 1999 (Cwlth),
water-based works to remove the Currency Creek
Regulator are now completed.
The boating exclusion zone has been removed.
The site has a stockpile of rock material that was
removed from the regulator. These will be removed when
weather conditions improve to enable access.
Construction of the Chowilla Creek Environmental
Regulator and associated structures is ongoing.
For public safety reasons the Chowilla Creek remains
closed to navigation at the construction site. Works
are also underway to upgrade the weirs on Pipeclay
Creek and Slaney Creek to improve the management of
flows into the Chowilla anabranch and to enable fish
Weir pool level changes at Lock 8 and Lock 9
The Lock 9 weir pool level is expected to increase by
up to 25cm above the full supply level over spring, and
the Lock 8 weir pool is expected to increase about 60cm
above full supply level.
Over summer and autumn, the weir pools will be lower
than full supply level.
Lock 9 is expected to be drawn down to about 40cm
below full supply level and Lock 8 will be drawn down to
about 50cm below full supply level.
Both weir pools will be gradually raised back to full
supply level by winter 2014.
River Murray water users at Lock 8 and Lock 9 can expect
changing weir pool heights over the 8 to 10 months from
August 2013 as part of a NSW river operations trial.
Public access around the weirs is restricted during
this construction program.