MUNICH — "It was gnarly. Dangerous. Only the most experienced could surf it," says Jakob Netzer of what local surfers have come to call the "E1," an ever-churning wave along a mountain stream that ...

For decades, enthusiasts rode the cresting Eisbach creek in the southern German city, some 200 miles from the nearest coast. But the wave has vanished, prompting arguments about how to restore it. For ...