WThe Tualatin River is a tributary of the Willamette River in Oregon in the United States. The river is about 83 miles (134 km) long, and it drains a fertile farming region called the Tualatin Valley southwest and west of Portland at the northwest corner of the Willamette Valley. There are approximately 500,000 people residing on 15 percent of the land in the river's watershed.
WDairy 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.
WFanno Creek is a 15-mile (24 km) tributary of the Tualatin River in the U.S. state of Oregon. Part of the drainage basin of the Columbia River, its watershed covers about 32 square miles (83 km2) in Multnomah, Washington, and Clackamas counties, including about 7 square miles (18 km2) within the Portland city limits.
WGales Creek, is a tributary, 23.5 miles (37.8 km) long, of the Tualatin River in Washington County, Oregon, United States. The headwaters of Gales Creek are on the north side of the mountain Round Top in the Northern Oregon Coast Range. The community of Gales Creek, Oregon, is near the creek, which further downstream forms the southwest border of the city of Forest Grove.
WHenry Hagg Lake is an artificial lake in northwest Oregon, in the United States. The reservoir is an impoundment of Scoggins Creek, which drains a small portion of the eastern side of the Northern Oregon Coast Range. The lake and creek are part of the Tualatin River’s watershed in the Tualatin Valley. It is located about 5 miles (8.0 km) southwest of Forest Grove.
WKi-a-Kuts Falls is a 40-foot (12 m) tall waterfall on the Tualatin River in Washington County, Oregon, United States. Discovered in 1993 in the more remote upper stretch of the river, the falls were named after the last chief of the local band of Native Americans, Chief Ki-a-Kuts of the Atfalati. The water descends in a single fall down a narrow channel in the basalt cliffs overhanging the river at that spot.
WOswego Lake is a lake in Clackamas County, Oregon that is completely surrounded by the city of Lake Oswego. Though the lake is naturally occurring, it has been significantly altered because of the concrete dam that has increased its size to 431.7 acres (1.747 km2). The United States Geological Survey records the official name as Lake Oswego and, because of its artificially increased size, classifies it as a reservoir. To distinguish it from the city, however, the lake is usually called Oswego Lake.
WThe Tualatin River National Wildlife Refuge is a 1,856 acres (751 ha) wetlands and lowlands sanctuary in the northwestern part of the U.S. state of Oregon. Established in 1992 and opened to the public in 2006, it is managed by the United States Fish and Wildlife Service. Located in southeastern Washington County, 15 miles (24 km) southwest of Portland, the refuge is bordered by Sherwood, Tualatin and Tigard. A newer area, extending into northern Yamhill County, is located further west near the city of Gaston surrounding the former Wapato Lake.
WWapato Lake was a historic lake located in what became parts of Washington County and Yamhill County in the U.S. state of Oregon. The area is sometimes known as Wapato Lake Bed and Wapato Flat. The lake bed is located about a half mile east of Gaston at 55 metres (180 ft) elevation. The lake bed soils contain a layer of organic peat that once supported a wetland community dominated by the wapato plant, Sagittaria latifolia, particularly in the upper marsh areas.