Looking for Topo/depth map of Lake Ballenger...

I'm trying to locate an accurate map showing depths and/or underwater structures in Lake Ballenger in the city of Shoreline/Mountlake Terrace. Does anybody out there fish this lake? I've googled the Lake and haven't got very far. Any suggestions and/or information?
Topo won't show structure under water just the bottom depths. I live just blocks from the lake and there is plenty of structure, see most people catching just north and south of the boat launch along the golf courses.