Skip to Main Content
(Press Enter)

Timberlands

Columbia Basin Management
Area Timberlands

The Columbia Basin Management Area (CBMA) comprises nearly 90,773 acres of working forestlands on the Washington-Oregon border.

The area includes the Columbia Basin Timberlands—managed and owned by Green Diamond—and the Three Rivers area, which Green Diamond has managed since it was acquired by Twin Creeks Timber (TCT) in 2021. Scattered along the Cascade Crest, the land offers views of Mount Adams and Mount Hood and is situated near prominent river corridors, including the Columbia and White Salmon. Tree species include Douglas fir, ponderosa and lodgepole pine, true firs and western larch.

In 2022, the CBMA Timberlands passed their first audit to the Sustainable Forest Initiative® standards, which guide us to continually improve the sustainable management of the forests for the long term. We manage several harvest units in the area, which create job opportunities in local rural communities and provide a variety of wood species to nearby mills. We also work with state and government agencies and local tribes—including the Confederated Tribes and Bands of the Yakima Nation—to protect cultural resources, fish and wildlife, and mitigate wildfire risks. Much of the region is covered under a Safe Harbor Agreement (SHA) to protect the northern spotted owl.

Columbia Basin Management Area

Mailing address: P.O. Box 268 • Bingen, WA 98605 • Physical address: 92 Office Road, Suite B
Underwood, WA 98605 • (360) 427-4040 • info@greendiamond.com

Columbia Basin
Management Area


90,773 acres

(see Resources for more information)

Public Access

More than 80% of our CBMA lands are open for free, public access, providing visitors with opportunities to bike, hunt, fish, hike and explore. The area includes the Washington counties of Klickitat, Skamania and Walla Walla, as well as the Oregon counties of Hood River and Wasco. A small percentage of land is leased for private recreation. For additional guidelines on public access in these areas, view our FAQ.

Please note:

  • Most TCT lands are open for general non-motorized recreation.
  • Green Diamond's CBMA property will be issuing firewood permits to the public starting on 10/17 and will close on 11/16. Closure is subject to weather and road conditions and may be shut prior to that date. Permits are available for $20 at Dickey's Farm Stand in Bingen, WA, and Little Mountain Hardware in Trout Lake, WA. Proceeds go to charity.

Conservation Plans and Permits

The CBMA is rich with diverse plants, fish and wildlife, which we work with government agencies and local conservation groups to protect. When TCT acquired the land, it adopted a Northern Spotted Owl SHA that was formed between the U.S. Fish & Wildlife Service and the previous landowners in 2012. The SHA covers 45,000 acres in Southern Washington and Northern Oregon. Green Diamond has also partnered on projects such as remediating a local bat cave and restoring high-priority fish passageways on Tony Creek.

TCT-Three Rivers Northern Spotted Owl Safe Harbor Agreement (SHA):

Covers 43,375 acres to protect the northern spotted owl from 2012 through 2072 (permit assumed in 2021). Conservation strategies include setting aside land and deferring harvest within northern spotted owl sites; planning for a 60-year average harvest rotation; implementing silvicultural provisions to create and maintain a mosaic of forest age classes; and implementing snag and wildlife tree prescriptions.

Learn more about our breakthrough research on the northern spotted owl.