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() is a city located primarily in Clackamas County in the U.S. state of Oregon. Small portions of the city are also located in neighboring Multnomah and Washington counties. It is located south of Portland and surrounds the private 405-acre (1.6 km²) Oswego Lake. As of the 2000 census, the city had a total population of 35,278. The 2006 estimate is 36,350 residents.
According to the United States Census Bureau, the city has a total area of 10.9 square miles (28.4 km²), of which, 10.4 square miles (26.8 km²) of it is land and 0.6 square miles (1.6 km²) of it is water. The total area is 5.57% water.
(wild swan) by Clackamas Indians) managed by the Lake Oswego Corporation. Houses with views of Oswego Lake and lakeshore property are very expensive and much sought after. This lake is navigable, with a dock at the east end where boaters can disembark and walk to the nearby businesses. The main canal from the Tualatin River was dug in the early part of the century.
Every five to ten years, the water level in the lake is lowered by opening the gates on the dam and allowing water to flow into Oswego Creek and on to the Willamette River, enabling lakefront property owners to conduct repairs on docks and boathouses. The lake was most recently lowered in October 2006.
The city extends up Mount Sylvania and through Lake Grove towards Tualatin.