It’s 11 miles long with almost 30 miles of shoreline.
The lake is patrolled by not only the U.S. Customs & Border Protection, but also the U.S. Coast Guard, Washington Department of Fish and Wildlife, and the Okanogan County Sheriff’s Office in the U.S., and the Royal Mounted Canadian Police in Canada.
The lake level varies from 46 feet to 208 feet, and is controlled by Zosel Dam in Oroville.
Osoyoos comes from the Indian word “Soo-yoos” meaning “place where two lakes meet.”
It’s part of a string of snowpack-fed lakes that stretch up into Canada, including Skaha, Okanagan and Kalamalka lakes.
The lake spills into the Okanogan River, which flows to the Columbia.
Lake temperatures reach 79 to 91 degrees Fahrenheit (26 to 33 degrees Celsius) in August.
It is one of a handful of lakes in the West that straddle the U.S.-Canadian border. Others include Ross Lake in British Columbia and the North Cascades National Park; Lake Koocanusa in British Columbia and Montana; Waterton Lake in Alberta and Montana; and Salt Lake in Montana, known as Alkali Lake in Saskatchewan. There are many others farther east, especially in the Great Lakes region.
Source: Osoyoos Lake Water Quality Society