Abert Rim

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Abert Rim in Lake County, Oregon is one of the highest fault scarps in the United States. It rises 760 metres (2500 feet) above valley floor. It was formed during the Miocene epoch. At that time basaltic flood lavas covered much of Eastern Oregon. In subsequent faulting, great blocks were tilted and Abert Rim is at the eastern end of one of these blocks, while Abert Lake lies on top of another. A river called Crooked Creek enters the lake from the south, however it has no outlet. The lake level varies and it has been known to dry up. It is one of the Great Basin lakes.

The escarpment and lake were first mapped on December 20, 1843 by John C. Frémont who named it after Col John James Abert, his commanding officer.