Lake Pateros is a reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 on the Columbia River

Columbia River

The Columbia River is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, Canada, flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Washington. It was created in 1967 with the construction of Wells Dam

Wells Dam

Wells Dam is a hydroelectric dam located on the Columbia River, downstream from the confluence of the Okanogan River, Methow River, and the Columbia River in Washington State. The dam, associated structures, and machinery make up the Wells Hydroelectric Project. It is owned and operated by...

. The reservoir lies almost entirely in Douglas and Okanogan counties, although the dam itself lies partially in the easternmost portion of Chelan County. The reservoir stretches from there upstream to the Chief Joseph Dam

Chief Joseph Dam

The Chief Joseph Dam is a concrete gravity dam on the Columbia River, upriver from Bridgeport, Washington, USA. The dam was authorized as Foster Creek Dam and Powerhouse for power generation and irrigation by the River and Harbor Act of 1946...

. Towns on Lake Pateros include Pateros

Pateros, Washington

Pateros is a city in Okanogan County, Washington, United States. The population was 643 at the 2000 census and increased 3.7% to 667 in the 2010 census.-History:Pateros was originally established as Ive's Landing in around 1886 by Lee Ives...

 and Brewster, Washington

Brewster, Washington

Brewster is a city in Okanogan County, Washington, United States. The population was 2,370 at the 2010 census.-History:In 1811, John Jacob Astor's Pacific Fur Company established Fort Okanogan just north of the present site of Brewster, which was the first American post in Washington...

.

Lake Pateros has been known by many variant names, including Butler Lake, Chief Long Jim Lake, Fort Okanogan Lake, Lake Azwell, and others.