Comprised of three separate units, the monument contains fossils and formations believed to be more than 40 million years old. Interpretive displays are located throughout the park, and fossils may be viewed at the Sheep Rock unit visitor center. Highlights include portions of the Oregon trail, the Umatilla Indian reservation, and the Blakely Grain Elevator. Call for reservations. Exhibits include railroad cars and related memorabilia.
Tours are available.
Located on the Columbia River, the lock and dam create lakes Wallula and Umatilla. Fish ladders allow migrating trout and salmon access to their spawning grounds. This upstream migration may be viewed through windows. The dam's hydroelectric plant annually generates 8.6 million megawatt hours of electricity. A visitor center offers tours of the powerhouse.