Brownlee Reservoir, NE Oregon and W Idaho, on Snake R., 43 mi/69 km E of Baker City, Oregon; c.90 mi/145 km long; 44°22'N 117°13'W. Max. capacity 1,426,700 acre-ft. Powder R. enters from W, forming 8-mi/12.9-km arm. Formed by Brownlee Dam (310 ft/94 m high), built (1959) by the Idaho Power Co. for power generation.