Agency Lake is a natural lake located west of Chiloquin in Klamath County, Oregon. It is actually the northern arm of Upper Klamath Lake, connected by a narrow channel. Its primary inflow is the Wood River, while its outflow is Upper Klamath Lake (indirectly the Link River, Upper Klamath Lake's outflow). The lake has a surface area of approximately 9,000 acres (36 km²). The lake is very shallow, and experiences high winds. U.S. Route 97 runs along the east side.