Fort Simcoe, Military fort in Yakima County, United States

Fort Simcoe is a historic military outpost in Yakima County with five preserved original buildings, including a commander's house, three officer residences, and a wooden blockhouse. The roughly 200-acre grounds are located in an area with natural springs.

Fort Simcoe was built in the late 1850s in an old oak grove watered by natural springs, on the route the Yakama people used between the Yakima Valley and their fishing grounds on the Columbia River. Future Confederate general Robert S. Garnett directed its construction, and architect Louis Scholl designed it. The Army abandoned the post on 22 May 1859 and handed it to the Bureau of Indian Affairs as the Yakama agency, where buildings served as a school; the agency moved to Toppenish in 1922 and the site became a state park in 1953.

Before 1850 the site held a school where Native children taken from their families were forced to stop traditional customs and speak English; non-compliant children could be jailed in a small jail. Later the Yakama agency buildings served as a school for children. The fort's placement on the Yakama route between the Yakima Valley and Columbia River fishing areas let troops watch visitors to the tribe.

Visitors can tour the interpretive center and original buildings from April through September with a Washington State Discover Pass requirement. The pathways between structures are flat and easy to walk.

The post abandoned traditional stockade walls in favor of strategically positioned blockhouses with thick walls and firing ports for defense. This design approach was unusual for military installations in the region.