Watson Falls - About 750,000 years ago volcanic eruptions produced a hot molten lava flow that filled this valley hundreds of feet deep with basaltic rock. Watson Creek spills over the northern edge of this flow to form Watson Falls.
Toketee Falls - Less than 250,000 years ago, molten lava spewed from a vent and flowed like a river through this valley. Basalt columns were formed as the hot lava cooled. The North Umpqua River drops over these formations.
Mt. Thielsen - This 9,182-foot peak was a fiery volcano over a million years ago. It has endured glacial, wind and water erosion through time.
Pumice deposits - Rivers of pumice ash flowing from Mt. Mazama followed the Upper North Umpqua and Rogue River valleys. Pumice banks and canyons up to 400 feet deep remain in the upper valleys. These deposits can be seen between Boulder Flat Campground and Whitehorse Falls along Highway 138 and between Hamaker and Union Creek on Highway 230.
Diamond Lake - The eruption of Mt. Mazama (Crater Lake) sent flows of pumice and ash into this valley, creating an earthen dam and impounding a new lake - Diamond Lake. Flowing springs and streams fill the 3,000-acre lake.
Crater Rim Viewpoint - Once a towering 12,000 foot volcano, Mt. Mazama violently erupted 7,700 years ago, creating the deepest lake in the United States (1,943 feet deep) - Crater Lake.