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Dairy Creek (Oregon)

Dairy Creek is a 10.55-mile (16.98 km) tributary of the Tualatin River in the U.S. state of Oregon. It begins at the confluence of its east and west forks near the unincorporated community of Schefflin and meanders southeast across the Tualatin Valley to the Tualatin River near Hillsboro, in Washington County. East Fork Dairy Creek begins at 45.788446°N 123.041498°W in Columbia County, slightly north of its border with Washington County, and flows generally south for 22 miles (35 km). West Fork Dairy Creek, also about 22 miles (35 km) long, forms at 45.7553899°N 123.178168°W, near the unincorporated community of Tophill, and flows generally southeast. Before railroads displaced river boats on the Tualatin, some steamships also worked the lower section of Dairy Creek, with plans to go as far up stream as Centerville.

Course
Main stem The roughly main stem of Dairy Creek begins at at the confluence of its east and west forks. Flowing southeast, it receives Council Creek from the right from the mouth and McKay Creek from the left less than later. It passes under Oregon Route 8 (Tualatin Valley Highway) west of Hillsboro about from the mouth before entering the Tualatin River about from its confluence with the Willamette River. Discharge The USGS monitors the flow of East Fork Dairy Creek at a station near the unincorporated community of Meacham Corner, from the confluence with the west fork and about from the mouth of Dairy Creek. The average flow at this station is . This is from a drainage area of , about 15 percent of the total Dairy Creek watershed. The maximum flow recorded there was in January 2003, and the minimum flow was in September 2007. ==See also==
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