Statistics for occurrence #1 of “Fort Klamath” in chapter 33 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

... Organized at large November 11, 1864, to January 2, 1865. Ordered to Fort Vancouver, Washington Territory, December 19, 1864. Duty in District of Oregon by Detachments at Fort Vancouver, Fort Klamath , Fort Yamhill, Fort Steilacoom, Fort Dalles, Fort Walla Walla, Colville, Fort Hoskins and Fort Boies, Idaho Territory, covering Boies and Snake River Country and the Owyhee Mines from Indian Raids. ...
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Fort Klamath (Oregon, United States) 24 8 0 0 0 user votes

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