Camp Warner, Military outpost in Eastern Oregon, United States.

Camp Warner was a US Army outpost at two sites about 35 miles apart near the Warner Lakes. Old Camp Warner, built in 1866 on Hart Mountain's eastern slope, was abandoned after one winter. Fort Warner, built in 1867 west of the lakes, had timber barracks for 280 troops, officer quarters, a hospital, bakery, and sawmill. Nothing remains of either site today.

The US Army established Camp Warner in 1866 as a protective post during the period of western expansion and armed conflicts with Native American tribes. The post was abandoned after less than two decades as military priorities shifted and the region changed.

The name Camp Warner honors Captain William H. Warner, a topographical engineer killed by Indians in 1849. Soldiers called the second site Fort Warner to distinguish it from Old Camp Warner, though the Army never officially designated it a fort. Military wives, including Mrs. Crook, lived at Fort Warner from 1867, and the post served as a supply depot during the Snake War.

The site sits at high elevation in a region with harsh weather and requires sturdy footwear and appropriate clothing for any season. Visitors should plan for limited facilities and bring plenty of water and supplies, as the location remains quite remote.

The Stone Bridge that let the Army cross the Warner Lakes wetlands in 1867 was not a bridge but a quarter-mile causeway of basalt boulders hauled from Hart Mountain and dumped into the marsh between Hart Lake and Crump Lake. Forty men under Captain James Henton built it from May 16 to July 24, 1867.