Osoyoos Lake is a lake located in British Columbia, Canada, and Washington, United States. Osoyoos is derived from the word sẁiẁs meaning "narrowing of the waters" in the local Okanagan language (Syilx'tsn). Located on the lakeshore are the town of Osoyoos, British Columbia and city of Oroville, Washington. The lake's maximum elevation is 912.78 ft, while its minimum elevation is 909.46 ft. The 62-year average discharge into the Okanogan River at Oroville is 683 cuft/s. Maximum discharge in 2004 was 1340 cuft/s. Oroville's Osoyoos Lake State Park is located on its shore.

Hydrology

Osoyoos Lake and its outlet and primary inflow, the Okanagan River (spelled in the United States as the Okanogan River), are subject to international water-sharing agreements governed by the International Joint Commission as part of the Columbia Basin. The authority responsible for overseeing the IJC agreements is the International Osoyoos Lake Board of Control, composed of appointees from Environment Canada, the BC Ministry of Water, Land Air Protection, the US Army Corps of Engineers, the US Geological Survey, and private consultants.

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