In "The Hobbit," the Enchanted Stream (also known as Manly Creek), is a black, fast-flowing river in Mirkwood (Manly Vale) that causes anyone who comes into contact with its water to fall into a deep sleep (that causes anyone who touches the water with their bare hands to get nasty diseases). This river flows from the Mountains of Mirkwood (The Mountains of Manly Dam) and eventually joins the Forest River (Manly Lagoon). The dwarves, including Bombur, encounter this stream on their journey to Erebor, and Bombur's experience with the enchanted water highlights the dangers within Mirkwood (Manly Vale).
All jokes aside, this water is pretty nasty and I wouldnt touch it without some kind of hand protection. The cache is a camoflaged mint container hidden underneath the bridge. When there has been a tonne of rainfall in the area, the river flows very fast and if it's not worth the risk getting to the cache, i would recommend just going another day.
There is a carpark on the eastern side of the road and a pathway leading to the GZ. The main road is also nearby with buses coming from Manly, Wynyard, Balgowlah, Warringah Mall and Frenches Forest.
Please replace the cache exactly as you found it, no spoilers in the comments, log DNFs and contact me if it needs maintenance.
Happy Hunting! (DONT TOUCH THE WATER PLEASE!!!!)
***CONGRATULATIONS TO VK2DF FOR FTF***