Bike tour around the Rurtalsperre reservoir lake

Another small bike tour or go home right away?
No question: Start and finish at Paulushofdamm north of Einruhr - clockwise around the lake, more or less along the shore and across the Schwammenauel dam (Heimbach). If you follow the bike path signs diligently, you don't have to push your bike on muddy hiking trails or lift it over tree trunks. But the point was to test an outdoor app. It convincingly shows 27 km for our round, but the total of over 700 meters of elevation gain is a bit exaggerated, even though there are quite a few ups and downs along the way.