Photo: Gary Halvorson, Oregon State Archives, CC BY 4.0, via Wikimedia Commons
🌤 Weather at Fort Yamhill State Heritage Area by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 38–68 °F | 49–83 °F | 38–78 °F | 35–51 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Dallas 2 NE, 16 mi away, elevation 290 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
⚔️ Tribal-Owned Fort Site — Site of the 1856–1866 U.S. Army post at the Grand Ronde Reservation in Polk County, owned by the Confederated Tribes of Grand Ronde since January 31, 2025
Fort Yamhill was a U.S. Army post built in 1856 at the edge of the Grand Ronde Reservation, where tribes from across western Oregon had been forced to move. The Army abandoned and dismantled it in 1866. The site lies in northern Polk County, about half a mile north of Valley Junction, reached by an unpaved gravel road off the Hebo Road (Highway 22).
For years the Oregon Parks and Recreation Department ran the site as Fort Yamhill State Heritage Area. In November 2024 the Oregon Parks and Recreation Commission approved its transfer, and on January 31, 2025 the sale to the Confederated Tribes of Grand Ronde closed. Tribal newspaper Smoke Signals reported that the property stays open to the public with no change in access, and that the Tribe plans to rename it; a new name had not been announced as of October 2026.
What to See
| Feature | Details |
|---|---|
| Officers’ quarters | One of only two buildings from the fort era that survive. The restored house stands on the fort grounds. |
| Trail and panels | A path with interpretive panels. Smoke Signals reported in 2025 that the existing panels focus on the soldiers, and that the Tribe wants to improve them. |
| Blockhouse (in Dayton) | The fort’s blockhouse was sold in 1866, moved to the Grand Ronde Agency, and taken to Dayton on June 9, 1911. It stands in Dayton’s Courthouse Square Park, not at the fort. |
Frequently Asked Questions
Is Fort Yamhill still a state park?
No. Since January 31, 2025 the Confederated Tribes of Grand Ronde own the site. Public access continued after the transfer, and Oregon state park rules no longer apply.
Did Philip Sheridan serve here?
Yes. As a young second lieutenant, Sheridan oversaw construction of some of the fort’s buildings, according to OPRD’s 2004 master plan. He later became a Union general in the Civil War.
Is Fort Yamhill a National Historic Landmark?
No. The fort site has been listed on the National Register of Historic Places since 1971 (reference 71000681). The blockhouse in Dayton is listed separately (reference 87000336).
Keep exploring: The closest neighbors are Erratic Rock State Natural Site (a short drive away) and H. B. Van Duzer Forest State Scenic Corridor (a short drive away).
Sources: Smoke Signals, February 3, 2025 and August 27, 2025; OPRD, Fort Yamhill master plan (2004); City of Dayton walking tour brochure (2022); National Register of Historic Places; Oregon State Land Inventory. As of October 2026.
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