Jordan River

The Jordan River is a 51-mile urban waterway flowing north from Utah Lake in Lehi through the Salt Lake Valley to the Great Salt Lake at Farmington Bay. It is the hydrologic spine of the Wasatch Front — the most populated corridor in Utah — and one of the few rivers in the American West that flows north. The Jordan drains the western slopes of the Wasatch Range through seven major tributaries: Big Cottonwood Creek, Little Cottonwood Creek, Mill Creek, Parley’s Creek, Emigration Creek, Red Butte Creek, and City Creek. Each of these canyons delivered the water, timber, and stone that built Salt Lake City, and each still delivers snowmelt to a river that has been straightened, dammed, diverted, and channelized for more than 170 years. The Jordan River Parkway — a 45-mile paved trail system paralleling the river from Utah Lake to the Great Salt Lake — is the largest contiguous urban trail in Utah and the primary public interface with the river today. The Jordan is not a wilderness river. It is a working river in a metropolitan area of 1.2 million people, and its story is about what happens to water when a city grows around it.

The Jordan River flows entirely through the sedimentary fill of the Bonneville Basin. The valley floor is composed of Lake Bonneville clays, silts, and gravels deposited when the lake covered the region during the last glacial maximum (~18,000 years ago). The river's gradient is extremely low — barely 14 feet per mile average — because it flows across a former lake bottom. At the Jordan Narrows between Lehi and Draper, the river passes through the only bedrock constriction on its course, where Paleozoic limestone and quartzite create a natural bottleneck that historically controlled lake levels. The Wasatch Fault, one of the most active normal faults in North America, runs along the eastern margin of the valley and has shaped the entire drainage geometry of the tributaries that feed the Jordan.

The Jordan River corridor is one of the most ecologically impaired urban waterways in the Intermountain West but also one of the most actively restored. The June sucker — found nowhere else on Earth — depends on the Utah Lake–Jordan River system for its life cycle. Water quality issues include nutrient loading, elevated temperatures, low dissolved oxygen in summer, and legacy contamination from mining and industrial activity. Despite this, the parkway corridor supports surprising biodiversity: over 200 bird species have been documented along the river, and beaver populations have reestablished in multiple reaches.