(Photo By The Trail Conservancy) AUSTIN (Austin Fitness Community) - For years, traversing the full circuit of Lady Bird Lake meant an awkward - and often traffic-heavy - detour near Longhorn Dam. This Saturday, that gap officially closes. The Trail Conservancy and the City of Austin are set to unveil the highly anticipated Wishbone Bridge and Unity Underpass , a massive infrastructure milestone that finally completes the 10-mile loop of the Ann and Roy Butler Hike-and-Bike