Bushnell-Irwin Rocks Research Natural Area

Bushnell-Irwin Rocks Research Natural Area

Roseburg District , BLM

Klamath Mountains Ecoregion

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Oregon white oak savanna or open woodland with forb or grasses
Oregon white oak-Douglas fir/poison oak woodland

The 388 ha Bushnell-Irwin Rocks RNA encompasses a variety of plant communities, including grass balds, oak savannas, oak-madrone-conifer woodlands, and mixed conifer forest. It lies on an extensive west-facing ridge system approximately 3 kilometers north of the town of Tenmile, west of Roseburg in Douglas County, Oregon. The site supports five special status species: Howell's lewisia (Lewisia cotyledon var. howellii), California sword fern (Polystichum californicum), spring phacelia (Phacelia verna), Thompson's mistmaiden (Romanzoffia thompsonii) and western isopyrum (Enemion stipitatum). Kanid, Beekman, and Vermisa are soils series represented. First to third order streams lie within the RNA and elevation ranges from 305 to 650 m. The maritime climate is modified by the rain shadow of the Coast Range. Summers are warm and dry, while winters are cool and wet. Average annual precipitation at the Winchester weather station, 24 km to the northeast, is 126 cm. The RNA may receive more precipitation due to its higher elevation. Past disturbance has been from wild fires.

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Access by unpaved roads and short cross-country hike