The Dreilägerbach dam, which was built between 1909 and 1911, is located between Roetgen and Rott. The reservoir behind the 38 meter high and 240 meter long dam wall has a capacity of 4.25 million cubic meters. An undisturbed hike around the drinking water reservoir is particularly attractive in the southern area. You will find hiking boards and signposted circular hiking trails in the surrounding hiking car parks.