The listed coordinates are incorrect: the cache is not located in Cray Reservoir! It's up to you to work out where I've hidden the cache, using the photograph below.
Please take care at the cache site, as there can be high winds at this location. The container is an ammo box. It is hidden under a small outcrop. Happy hunting!
If you like this image, you may download a larger, high quality version -- but note that this version is for visual pleasure only!