At N = 48° 00,926 / E = 13° 47,797 there is the official parking lot at the western side of the bridge, but you can also try to leave your car near N = 48° 00,952 / E = 13° 47,721 (there is a playground and a table). On the eastern side of the bridge there is a little "restaurant".
There is a (partly) paved track leading down to the fall. It took me less than an hour to walk down from the car, hide the cache and return. Therefore I guess that approximately 45 min should be enough for the cache-hunt (not accounting for staying a long time at the various vista-points).

Imagine the time when salt, the "white gold" was brought down the river on wooden rafts from the Salzkammergut. The waterfall was quite a challenge then. 1552 a wooden channel was built to bring the rafts down (the long ramp that is now used for the powerstation was part of that workaraound).

The Cache is a 500 ml plastic-box: Please do not remove Pencil, sharpener and Logbook.
GPS-Reception wasn't very good, the coordinates were taken from the measurement with the highest accuracy.
There was no one around when I hid the cache (no wonder: Winter, bad weather), on sunny summer-days this might be different.

Safety-Notice
Do not enter the river-bed (according to the warning signs there may be floods). Do not enter any of the small caves in the banks, they do not look very solid to my eyes.
Basically the waterfall can be visited any time, but there is no "winterservice". So be aware of the fact that it might be slippery and icy.