The Rappbode Auxiliary Dam near Trautenstein is used, together with the main dam, for supplying drinking water and for flood protection.

The auxiliary dam impounds the River Rappbode.

The area around the Rappbode Auxiliary Dam is well-suited to walking.

Its eastern shore is dominated by numerous rocky crags.

On the most important lakeside rocks, where today the reservoir and, formerly, the Rappbode river makes a small bend, there was once a castle, the Trageburg, which, like the Susenburg not far away, was used to guard an old long-distance trade route.