Really enjoy this spot. Great for open water swimming.
There are some things to be aware of.
No lifeguards and no supervision, so make sure of swimming competency, take a float.
The water level varies from summer to winter, so care must be taken for submerged obstacles. There are villages (buildings), old walls, that can be seen when water is low.
Water can become very cold, very quickly due to the dam being in a valley and fed by mountain streams.
Good quality water.
Although there is a rope with floats by the dam, swimmers should stay well away from the wall due to currents.
Finally. Please be aware of hydroplane activities. The plane will do numerous practice runs as the dam serves for a reservoir to combat forest fires. The practices, especially the release of water, are quite spectacular, but do not assume the pilots can see you. Stay close to the sides when the plane is around.
Furthest swim was just over 3000m.
Sandy beach is a welcome start and finish point.