Bluestem Lake is a reservoir in Osage County, Oklahoma, about 4.5 miles (7.2 km) northwest of Pawhuska. Alternate names are City of Pawhuska Lake and Pawhuska Lake. It covers 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 metres (876 ft). Completed in 1958, the lake is a secondary water source for Pawhuska and also was designed for flood control and recreation.