Omak Rock, Granite rock formation near Omak Lake, Washington.

Omak Rock, also called Balance Rock, is a glacial erratic and balancing rock inside the Colville Indian Reservation in Washington, about 410 metres from Omak Lake. The boulder rests in precarious balance on its base, a form left by glacial deposition rather than a granite outcrop rising in place.

The granite formation stood unchanged during the 1872 North Cascades earthquake, surviving the seismic event intact. This survival made it an important reference point for geologists studying earthquake patterns and ground movement in the region.

The Confederated Tribes of the Colville Reservation regard Omak Rock as a symbol of nature's perfection in the region. The rock lies within the Colville Indian Reservation, in the Greater Omak Area of the Okanogan Country.

Omak Rock lies within the Colville Indian Reservation, about 410 metres from Omak Lake, in the Greater Omak area of Okanogan Country. The surrounding land is tribal territory, so visitors should check access rules with the Confederated Tribes of the Colville Reservation before setting out. The rock is a glacial erratic standing in open country, so plan for unpaved ground and changeable weather.

Geologists use this formation as a reference point for understanding earthquake impacts in the area. Scientists have studied how it responded to historical seismic stress and what its stability reveals about ground movement patterns.