The route from the road to the reservoir takes around 10-15 min.
The following is taken from: "Abandoned reservoir off Telok Blangah discovered" -- The Straits Times, 17 Sep 2014
"An abandoned and forgotten reservoir dating back to 1905 has been discovered by the National Heritage Board (NHB).
Nestled in the Mount Faber forest, and not marked out in maps today, it served as a source of water for the Tanjong Pagar Dock Company, which was the forerunner of today's Port of Singapore Authority.
The reservoir, which is an oasis of calm and a green pocket in the built up area, also used to be a swimming pool according to pre-war and post-war maps. Remnants of a diving board and a bathing area still stand today.
The place, known to some as the Keppel Hill Reservoir, made the news when two soldiers and a 17-year-old boy drowned there on separate occasions - in 1936 and 1948.
The 2m deep pool of water, which has a working filtration system today, was discovered by a team of researchers from the board in February while doing a study on the topographical changes in Singapore over the past 100 years.
Meanwhile, the NHB said the discovery is historically significant because of the building materials and methods used. The bricks used to build the reservoir show that the body of water was constantly in use. Some were handmade and date back to the colonial period while others come from Jurong Brickworks which was established in 1934."
For an idea of how the area looks like now, do watch "The Forgotten Reservoir" , a documentary produced by the National Heritage Board.
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Directions:
Walk via Wishart Road to Keppel Hill. You should see Joaquim Garden & Landscape Pte Ltd on your left. Go towards the end of the road. When you come to this white barricade, walk around it.
Walking further on, you will come to a crossroads. The path to the right leads to a gate to an abandoned house, No. 11 Keppel Hill. Take the left path. Go all the way towards the end, where you will see an open area on your left. Continue going straight. The path is not obvious in the photo below, but you'll see it when you're there.
After around 5 min, you should come to a bridge across a small stream. There is a fallen log over the bridge, so you'll have to duckwalk across/crawl. Be careful not to fall in.
There's a small slope up immediately after the bridge (be careful, it's slippery especially after heavy rain), continue on the short path and you'll reach the reservoir.
I'll leave it to the finders to post pictures of the reservoir. Do not post pictures of the hide. Feel free to explore around, but don't go too close to the edge. Cache contains a logbook, a pencil and a sharpener.
For the more intrepid explorers, you can continue on the path uphill (around 100m away) to find the tomb of a Japanese civilian naval engineer who passed away in 1942. It was commissioned by the Imperial Japanese Navy in December 1943. For more info, read this: https://remembersingapore.org/2016/03/06/japanese-tomb-mount-faber/
Happy caching, and remember to stay safe!
Note: Coordinates may be off, but as long as you stick to the hint, the cache should be easily found. Do post more accurate coordinates if you have a good GPS.