Until 2012, Yellowknife did not have a permanent road connection to the rest of Canada's highway network, as the Yellowknife Highway relied, depending on the season, on ferry service or an ice road to cross the Mackenzie River. With the completion of the Deh Cho Bridge, which officially opened on 30 November 2012, the city now has its first direct road connection to the rest of the country. One still-used ice road connects Yellowknife with the neighbouring community of Dettah, to the southeast across an arm of Great Slave Lake; or a drive via the Ingraham Trail.