Oswego Lake

Oswego Lake
Lakewood Bay (connected to the main lake in 1928)
Oswego Lake Show map of Oregon Oswego Lake Show map of the United States
Location	Lake Oswego, Clackamas County, Oregon
Coordinates	45°24′34″N 122°41′47″W / 45.40944°N 122.69639°W / 45.40944; -122.69639
Type	Kolk depression/Reservoir
Primary inflows	Tualatin River, Springbrook Creek
Primary outflows	Willamette River (via Oswego Creek)
Catchment area	6.6 sq mi (17 km2)[1]
Basin countries	United States
Max. length	3 mi (4.8 km)
Max. width	0.3 mi (0.48 km)
Surface area	431.7 acres (1.747 km2)[2]
Average depth	26 ft (7.9 m)[1]
Max. depth	55 ft (17 m)[1]
Water volume	10,055 acre⋅ft (12,403,000 m3)[1]
Residence time	2 months[1]
Shore length1	11.95 mi (19.23 km)[2]
Surface elevation	99 ft (30 m)[1]
Islands	Jantzen Island
Settlements	Lake Oswego
1 Shore length is not a well-defined measure.

Oswego Lake is a lake in Clackamas County, Oregon, United States, that is completely surrounded by the city of Lake Oswego. Though the lake is naturally occurring (a former channel of the Tualatin River), 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.^[3] To distinguish it from the city, however, the lake is usually called Oswego Lake.^[4]