 After spending the winter of 1849 in Salt Lake City with his wife and daughters and teaching a class in Tahitian to prospective missionaries, Pratt and Jefferson Hunt blazed a route from Salt Lake City southward through present-day Las Vegas and San Bernardino, and then northward to Sacramento.The trail they carved would be followed by many settlers and Forty-niners.For much of its distance, that route is now followed by I-15.