I would think Department of Water or Department of Planning and Infrastructure (DPI), I'm not sure it would just be freely available.
There is a program called TenGraph that is used for viewing tenements but shows many other DPI layers that you may be able to use, there is an online version that I think you can get here (http://www.doir.wa.gov.au/aboutus/FC0D43DC45B946FFAFA544EF610B0D27.asp#22859) but you will have to register.
How urgent is it? I can try getting you a map at work tomorrow if you like. I'm not sure if it will have the detail you require though, this system is mainly used for mining info
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There is a program called TenGraph that is used for viewing tenements but shows many other DPI layers that you may be able to use, there is an online version that I think you can get here (http://www.doir.wa.gov.au/aboutus/FC0D43DC45B946FFAFA544EF610B0D27.asp#22859) but you will have to register.
How urgent is it? I can try getting you a map at work tomorrow if you like. I'm not sure if it will have the detail you require though, this system is mainly used for mining info