Fort Rock State Natural Area - Oregon
Posted by: 
Volcanoguy
N 43° 22.248 W 121° 03.930
10T E 656728 N 4803810
Fort Rock (a National Natural Landmark) is a spectacular wave-cut feature standing on the floor of a pluvial lake basin.
Waymark Code: WM1P7G
Location: Oregon, United States
Date Posted: 06/14/2007
Views: 37
The dry Fort Rock basin was filled by pluvial Fort Rock Lake at the end of the last ice age. The most recent high stand of Fort Rock Lake occurred around 23,000 years ago and a shallow lake was still present about 13,000 years ago.
Fort Rock, with its spectacular wave-cut cliffs, is a tuff ring 4,500 feet in diameter and 200 feet high at its crest. The south side of the tuff ring has been breached by waves of Fort Rock Lake, giving easy access to the crater. The present crater floor is 20 to 40 feet above the floor of the lake basin. Wave-cut benches have been cut into the ring, the most prominent lies at an elevation of 4,430 feet.
There is a parking lot, interpretive signs, and restrooms at the southeastern base (N 43° 22.361’ W 121° 03.937’). From the parking lot trails lead into the center of Fort Rock.
Park Type: Day Use
Activities:
Interpretive signs and hiking trails.
Background:
Scenic point of geologic interest. Basaltic tuff ring resulting from interaction of rising magma and groundwater.
Link to Park: [Web Link]
Park Fees: Not listed
Date Established?: Not listed
Additional Entrance Points: Not Listed
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