Page "Lake Oswego, Oregon" Paragraph 20

Every five to ten years, the water level in the lake is lowered several feet 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.

In 2010, the lake was lowered approximately to allow for construction of a new sewer line, the lowest lake level since 1962 when the original sewer line was installed.