Based at JHQ Rheindahlen in the early 1970s it was standard practice to visit the Dams or in my case the Möhnesee during ones' tour in Germany.
I took this photo of the dam in 1973, but struggled then as now when I examine the photo to see where repairs to the face had been made, although to be fair the photo was taken thirty-years after repair and assume the brick facing has weathered over the years.