It is actually the northern arm of Upper Klamath Lake, connected by a narrow channel.

[2][3] Its primary inflow is the Wood River, while its outflow is Upper Klamath Lake (indirectly the Link River, Upper Klamath Lake's outflow).

[6][7] The Bureau of Land Management (BLM) has been working to restore 3,000 acres (12 km2) of wetland near the mouth of the Wood River since 1997.

The BLM also plans to add walking trails and picnic areas.

[4][5][6][7] Agency Lake can be accessed by boat or canoe from the marshes route off Malone Springs.