As you might be able to tell from these photos.
They could not have place it in a worse position.
This is the exract taken from the link westozwind provided:
"The Bent St Navigation Channel Capital Dredging works will commence offshore from the Bent St Boat Launching Facility during September 2013 with completion scheduled in December 2013.
The navigation channel dimensions are; 300m x 30m x ??? 1.6cd (chart datum).
The works shall be carried out by Cutter Suction Dredge which dredged material to be used to nourish foreshores within close proximity to the dredging site in Warnbro Sound.
The Bent St Boat Ramp will remain operational and available for public use throughout most of the project. However, there will be some disruption and the City apologises for any short term inconvenience that may result.
These works are essential to the ongoing improvements and upgrading of the City???s marine infrastructure to meet the safety needs of boat owners and improving access to the coast.
This project has been funded by the Department of Transports Recreational Boating Facilities Scheme."
Seems to me the council took in the safety needs of boat owners whilst transitting but not the needs of all other recreational users of the pond itself.