Big Cottonwood Creek

Big Cottonwood Creek
River
Big Cottonwood Creek near Big Cottonwood Park
Country	United States
State	Utah
Source
- location	Brighton, Utah, Salt Lake County, Utah
- elevation	9,600 ft (2,926 m)
- coordinates	40°36′0″N 111°35′0″W / 40.60000°N 111.58333°W / 40.60000; -111.58333
Mouth	Jordan River
- location	Murray, Utah, Salt Lake County, Utah
- elevation	4,250 ft (1,295 m)
- coordinates	40°40′47″N 111°54′42″W / 40.67972°N 111.91167°W / 40.67972; -111.91167Coordinates: 40°40′47″N 111°54′42″W / 40.67972°N 111.91167°W / 40.67972; -111.91167
Length	26 mi (42 km)
Basin	43 sq mi (111 km2)
Discharge	for Murray, Utah
- average	31.3 cu ft/s (1 m3/s)
- max	380 cu ft/s (11 m3/s)
- min	5.0 cu ft/s (0 m3/s)
Little Cottonwood Creek and other Salt Lake County streams

Big Cottonwood Creek is one of the largest streams entering Salt Lake Valley from the east from the Wasatch Mountains. The creek flows through the Big Cottonwood Canyon in a westerly direction until it emerges into Salt Lake Valley about eighteen miles (29 km) from its highest source. Thence its course is northwesterly through Cottonwood Heights, Holladay, and Murray, Utah until it empties into the Jordan River about five miles (8 km) south of Salt Lake City. In the summer its waters are all used for irrigation purposes. From its source to its original outlet into the Jordan River is a distance of about twenty six miles.

The creek flows from around 9,600 feet (2,900 m) at the headwaters to around 4,250 feet (1,300 m) when it reaches the confluence with the Jordan River. The stream flows in a northwest direction as it leaves the headwaters near Brighton and then travels southwest about halfway down the canyon near Reynolds Gulch. At the base of the canyon the stream leaves the Uinta-Wasatch-Cache National Forest and a portion of the flow enters the Big Cottonwood Treatment Plant to provide municipal drinking water. At this point the stream again flows northwest until the confluence with the Jordan River around the Murray area.

The source waters at the top of the canyon begin near the Brighton Ski Resort and flow from Silver Lake, Twin Lakes Reservoir, Lake Mary, Lake Martha, Lake Catherine, and Dog Lake. Additionally precipitation and many tributaries along the canyon contribute to Big Cottonwood Creek’s water volume. Brighton receives over 50 inches (1,300 mm) of precipitation annually, most in the form of snow. 400 inches of total annual snowfall are measured. The average water yield of Big Cottonwood Creek is 52,864 acre feet (65,207,000 m³), which is the highest water yield of any Wasatch Front canyon stream in Salt Lake County. This canyon is a protected watershed area under strict management controls since it is a major source of drinking water for Salt Lake City. No dogs or horses are allowed. The water quality provides an excellent source for drinking water.