to Roosevelt Island where a new bridge over the parkway, which opened on June 11 of that year, connected it to the Custis Trail. Later that same year a new trail segment was built in Fort Hunt Park where the trail had been on road. That represented the last new section of trail. However, many sections of trail have been improved, and several new connections to the trail have been built. In March 1992, work began on the Crystal City Connector Trail that connected the trail to Crystal City via a pedestrian tunnel that had been built when the railway was moved nearly a decade beforehand. The Connector opened on August 22, 1992. Between 1994 and 1999, Arlington County built a trail connection between the Mount Vernon Trail at Memorial Circle and the sidewalk along Washington Boulevard that would eventually become the Washington Boulevard Trail. In 2003, the Wilkes Street Tunnel Trail, which was constructed between 1980 and 1999 was connected to the on-street portion of the trail at Union Street. In 2006, after it was determined that the bridge over the north entrance to National Airport was deteriorating and that the Mount Vernon Trail was a safety concern because of its close proximity to the roadway, the bridge was rebuilt and the trail was realigned and widened in the area. That section opened in 2007. In June 2009, the trail on the new Woodrow Wilson Bridge opened with a connection to the Mount Vernon Trail and in July 2012, the trail beneath the bridge and approaching it was rebuilt. In 2011, the National Park Service rebuilt the Humpback Bridge, which involved changes to the roadway, widening the Mount Vernon Trail, adding a barrier to separate the trail users from the traffic, lowering the grade across the bridge to improve sight distance, and adding a pair of trail tunnels under the bridge for safer passage between the Columbia Island Marina, the Mount Vernon Trail and, in the future, Boundary Channel Drive. The trail lane opened on March 18. In 2012, the Park Service realigned the trail at Memorial Circle, moving the crossing of Washington Boulevard a few hundred feet south and creating a crossing at a right angle to the road. In June 2016, the section of the trail next to the airport was realigned, widened and separated from the parkway. On May 24, 2017, the National Park Service opened