It seems the City Creek Stream naturally ran from the canyon into parts of Salt Lake City.

City Creek Canyon, located northeast of Salt Lake City, collects water from 19.2 square miles of watershed that feeds the 14.5 mile-long City Creek stream. Since the arrival of the Mormon pioneers in 1847 this water supply has been used by first the settlers, and later the inhabitants of the City. It played a significant role in the valley’s early history, as the settlement was based on agriculture through artificial irrigation of the desert soil. City Creek was designated as the pioneer’s first source of water providing both irrigation and domestic supplies. Today it remains an important part of the City’s water supply providing water by gravity flow to the Avenues, Ensign Downs and downtown areas. PDF source

City Creek is a small but historically important mountain stream that flows from City Creek Canyon and across part of Salt Lake City, Utah, and into the Jordan River which empties into the Great Salt Lake. Source