The Sinnott Memorial Observation Station is a sheltered viewpoint built into the caldera cliff 900 feet above Crater Lake in southern Oregon, United States.

As chairman of the House Public Lands Committee, Sinnott had actively supported Crater Lake National Park.

During construction, Sager spent hours in a rowboat on the lake, ensuring the building blended perfectly into the caldera cliff.

Horace M. Albright, the director of the National Park Service, attended the dedication ceremony along with William Gladstone Steel and many other dignitaries.

The new exhibits cost $425,000, and include easy-to-understand displays with a video program that shows how Mount Mazama was created, how the mountain collapsed, and how the lake formed.

[8] The Sinnott Memorial Observation Station is built on Victor Rock, an outcropping on the cliff face of Crater Lake's caldera wall, approximately 50 feet below the crest.

The structure's rustic style set the architectural standard for future buildings constructed at Crater Lake National Park.

A door on the east side of the room leads to the exit stairs which is hidden from view by a stone wall.