Lake Ouiachic (also referred to as the Álvaro Obregón Reservoir) is located in the foothills of the Sierra Madre Occidental and is created by the Álvaro Obregón Dam. Lake Ouiachic is fed by and drained by the Yaqui River. The dam was completed in 1952 with the purpose to regulate water flow of the Yaqui River, prevent floods, and generate electricity. Lake Ouiachic is also an expanding tourist and resort area specializing in fishing, boating, and water skiing.

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Lake Ouiachic
from space, October 1994
Lake Ouiachic
Location	Sierra Madre Occidental, Cajeme, Sonora, Mexico
Coordinates	27.8722°N 109.8640°W / 27.8722; -109.8640
Type	reservoir
Primary inflows	Yaqui River
Primary outflows	Yaqui River
Basin countries	Mexico
Max. length	19.6 km (12.2 mi)
Max. width	7.8 km (4.8 mi)
Islands	numerous islands and islets

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