In April 1847 Young led a small advance party of about 150 Mormons on the 2000km journey to the Salt Lake Valley. They left the Oregon Trail and took the route used by the Donner Party. Just as Young finished the journey, another wagon train of 1500 Mormons was setting off from Omaha. Thanks to the advance party this group had a clear route to follow. From 1847-69 70,000 Mormons followed the Mormon Trail to the Salt Lake Valley.