In 1970 it was decided that the falls would be developed for hydroelectric power, and it led to major demonstrations, called "Mardøla action" to protect the waterfall. The result was unfortunately that the waterfall was closed, but every year during the period 20 June to 20 August the floodgates are opened and you can see the waterfall again. Follow RV660 from Eidsvåg / Eresfjord to Eikesdal along the beautiful Eikesdalsvatnet. Road (toll road) from the valley to the west of Eikesdalsvatnet. Stop at the parking in Mardalen. Marked trail from there up to Mardalsfossen. The hike to the falls is about. 2 km, and it takes 45 minutes to walk the trail up there. You can go right up to the waterfall, but it's wet and rushing there, so it is recommended that you bring rain gear. Eikesdal Bygdalag have a small house there, with a guest book in which you are encouraged sign into.