Lower Goose Creek Reservoir is a lake located 4,734 feet (1,443 m) above sea level, south of the town of Oakley in Cassia County, Idaho, United States. Oakley Dam impounds the reservoir's primary inflow, Goose Creek. All of the creek's water is stored in the reservoir for irrigation. Lower Goose Creek Reservoir covers an area of 1,006 acres (407.1 ha).