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Bluestem Lake is a reservoir in Osage County Oklahoma about 4.5 miles (7.2 km) northwest of Pawhuska. It is at the convergence of Middle Bird Creek and South Bird Creek. The outflow is Middle Bird Creek. The lake has a surface of 762 acres (3.08 km2) and a shoreline of 19 miles (31 km).Coordinates are:Latitude: 36°42’19.7 Longitude: -96°25’9.06. Elevation above sea level is 267 meters.