Boundary Tours

Discover the Boundary Hydroelectric Project nestled in the foothills of the Selkirk Mountains and positioned along the banks of the scenic Pend Oreille River. Enjoy a guided tour to experience how our 299,000 horsepower turbines and electrical generating facilities produce clean, renewable energy.

You'll be taken through the Visitors' Gallery located deep inside a massive limestone cavern.

Free Guided Tours

Boundary Dam cavern

Free tours are offered:

  • Memorial Day weekend through Labor Day weekend
  • Thursday – Monday
  • at 10:30 am, 12:00 pm, 2:00 pm, and 4:00 pm


  • Tour is good for all ages
  • Photo ID is required for all adults as some areas of the project are restricted
  • Wear closed-toe shoes
  • Each tour is limited to 25 persons on a first-come, first-served basis

Contact Us

Reservations are not required, however, if your group is 10 or more, you should call in advance.

Call (509) 446-3083 and select option 9, or email us at

Local Sites to Visit

There are many neighboring attractions you may want to visit while in the area.

Gardner Cave

Check out Gardner Cave—Washington's second-longest limestone cave—at Crawford State Park. Free guided tours provided by Washington State Parks. Please call (509) 446-4065 in advance for large groups. Tour groups limited to 25.

Cutter Theatre

Built in 1912, this historic former school is now home to the area's community and performing arts center. Free guided tours are available upon request by calling (509) 446-4108.

Sullivan Lake and Mill Pond Historical Site

Visit the Colville National Forest website or call the Sullivan Lake Ranger District at (509) 447-7300 for information on hikes and camping in the area. In late fall and winter, watch for bighorn sheep at the sound end of the lake.

Learn More about Boundary Dam and Pend Oreille County

Explore the area before you go so you can plan your perfect trip.

Northwest Backroads Boundary Dam video

"Touring to and through Boundary Dam" by Susan Swan

Boundary Dam Recreation Opportunities video

Pend Oreille County and its People video