Druid Lake has the most potential of the three reservoirs, but the city needs help to maintain all three, even the hilly patch of open space officials envision in Guilford. Construction of the underground tanks won't be completed for several more years, and that gives the city plenty of time to figure out how to successfully manage the transition. As with any waterfront activity, there are always safety issues to contend with — lifeguards for swimmers and boaters, for example — as well as routine maintenance, trash removal and provision for public restrooms and other amenities. Whatever entities eventually emerge to oversee the changeover will also have to recruit business owners and private donors who can generate enough cash to do what needs to be done to keep the operation afloat. The city has to make it clear that if the partnerships run into trouble, they can't look to taxpayers to bail them out.