The description for Bjønndalsbekken Wi4 sounded great. It's a 3 pitch 150 m long route. It's between Sjoa and Otta. Park the car here (61.71580,9.53123). From there, if you continue a little bit towards Otta and head up, you will hit an lumber road. That is making the approach a bit more comfortable.
Somewhen you have to leave the path and head towards the fall. We didn't had a track, so we had to do it by ourself.