Site 4 - St Leonards

St Leonards is surrounded by numerous significant tidal and non tidal wetlands that are conducive to mosquito breeding if untreated.  The most significant sites are those large wetlands, which make up a very large area that is influenced by both tidal activity and rainfall.  Wetlands along the edges of Swan Bay and on Edwards Point are approximately 70 hectares.  The Salt Lagoon and St Leonards Lake, within the township, are both significant in terms of impact to residents, particularly St Leonards Lake.  Salt Lagoon is of concern, mainly early in the season, with the presence of water, however it fairly quickly dries out.  The lagoon is regularly monitored after storm events and can also be influenced by sub-terrainean water.  St Leonards Lake is a freshwater lake with very little water movement and significant vegetative growth around the edges, which makes monitoring and effective treatment difficult.  The lake is continually monitored and treated with a slow-release product, although it is suspected that a residual quantity of mosquitoes do hatch from the lake, due to the limitations of treatment.  This is verified by the consistent results of mosquitoes that are trapped, indicating approximately 70% of mosquitoes are from saltwater origin and the remainder from freshwater.  

Click on the links below to view aerial photos

Below are some photos of mosquito breeding and treatment sites that impact on the township

Wetlands behind Cliff Street	Wetlands around Lower Bluff
St Leonards Lake	St Leonards Lake Spillway