A good place to park for this cache would be next to the water pump building at the end of the extension to Hawthorne Road.
From there it is a quick walk along the river to where there are two side paths. The first will show you a scenic view of the valley, whereas the second is the path to the cache. Take the second path and make your way down to the water over the rocks heading towards the Anarchy symbol.
The cache can be found near the water, there is no need to get wet or cross over to the other side.
BYOP